Business Aviation
FAA 5G Upper C-Band Mandates Impact Aviation Radio Altimeters
NBAA joins coalition addressing FAA’s new 5G Upper C-Band mandates requiring radio altimeter upgrades by 2029-2034 to prevent interference.
This article is based on an official statement from the National Business Aviation Association (NBAA) and regulatory filings regarding the FAA‘s January 2026 Notice of Proposed Rulemaking.
The National Business Aviation Association (NBAA) announced on January 16, 2026, that it has joined a broad coalition of industry stakeholders to address significant technical and logistical challenges posed by the Federal Aviation Administration’s (FAA) latest regulatory proposal. The FAA’s Notice of Proposed Rulemaking (NPRM), published on January 7, 2026, outlines strict new performance standards for radio altimeters to mitigate interference from future 5G telecommunications networks operating in the “Upper C-Band” spectrum.
This new regulatory push is driven by the “One Big Beautiful Bill Act” of 2025, federal legislation that mandates the auction of the 3.98–4.2 GHz spectrum band for commercial wireless use by July 2027. According to the NBAA, the aviation industry is now facing a tight timeline to develop, certify, and install next-generation equipment before these new wireless services go live, with initial compliance deadlines projected between 2029 and 2032.
The NBAA is collaborating with Airlines for America (A4A), original equipment manufacturers (OEMs), and the Radio Technical Commission for Aeronautics (RTCA) to ensure that the proposed rules are technically feasible within the mandated timeframe.
While the aviation industry spent much of 2022 and 2023 retrofitting aircraft with filters to protect against 5G signals in the “Lower C-Band” (3.7–3.98 GHz), the new mandate addresses a distinct and more complex challenge. The upcoming expansion involves the 3.98–4.2 GHz band, which sits significantly closer to the 4.2–4.4 GHz frequency range used by radio altimeters, critical safety instruments that measure an aircraft’s height above terrain.
According to technical details released in the NPRM, the proximity of these high-power wireless signals renders previous “filter-only” solutions insufficient. The NBAA notes that the new mandate will likely require the full replacement of radio altimeter units with new hardware designed to meet stricter Minimum Operational Performance Standards (MOPS).
A primary concern raised by the NBAA is the current lack of commercially available equipment to meet the FAA’s proposed standards. The industry is currently in a “solutions gap,” where the regulation demands performance specifications that manufacturers are still in the process of defining.
Heidi Williams, NBAA Senior Director of Air Traffic Services and Infrastructure, highlighted this discrepancy in the association’s statement: “The timelines proposed will be challenging in light of solutions that haven’t yet come to market… Achieving the proposed rule’s objectives, on any timeline, will require continued collaboration between industry stakeholders, the FAA and standards organizations.”
The FAA’s proposal sets a rigid schedule driven by the legislative requirement to auction the spectrum by July 2027. Based on the NPRM and industry analysis, the key milestones are as follows:
The FAA estimates that this rule will affect approximately 58,600 aircraft in the U.S. fleet. Industry estimates cited in the reporting suggest the total cost for these fleet-wide upgrades could exceed $4.5 billion.
The friction between the “One Big Beautiful Bill Act” and aviation safety highlights a recurring tension in modern infrastructure development: the pace of legislation versus the pace of engineering. Unlike the previous 5G rollout, where filters could be applied to existing hardware, the Upper C-Band expansion requires the invention and certification of entirely new avionics.
With the RTCA not expected to finalize the technical standards until March 2027, just months before the spectrum is legally required to be auctioned, manufacturers will be under immense pressure. If the standards are delayed, or if the certification process hits snags, the 2029 compliance window could close rapidly, potentially risking a repeat of the flight disruptions seen during the initial 5G rollout. The “collaboration” the NBAA speaks of is effectively a race to ensure the regulatory requirements do not outpace physical manufacturing capabilities.
To mitigate these risks, the NBAA is working closely with the RTCA Special Committee 239 (SC-239). In late 2025, this committee shifted its focus from producing a guidance document to developing a full Minimum Operational Performance Standard (MOPS). This shift is intended to ensure a robust, long-term technical solution that creates altimeters immune to the closer, more powerful 5G signals.
Airlines for America (A4A) echoed the need for cooperation in a statement regarding the new spectrum usage:
“We have been working collaboratively with the telecommunications industry, the FAA and the FCC to identify solutions that ensure our nation’s airspace remains safe while allowing the spectrum to be used.”
The FAA estimates the rule covers approximately 58,600 aircraft, including commercial airliners (Part 121), foreign carriers (Part 129), and business/general aviation aircraft equipped with radio altimeters.
General and business aviation operators have a compliance deadline set for two years after the initial commercial deadline. Based on current projections for 5G deployment, this places the business aviation deadline between 2031 and 2034.
The filters installed previously were designed for the “Lower C-Band” (3.7–3.98 GHz). The new legislation opens the “Upper C-Band” (3.98–4.2 GHz), which is much closer to the altimeter’s operating frequency. The existing filters cannot block interference from this adjacent band without degrading the altimeter’s performance, necessitating full unit replacement. Sources:
NBAA Mobilizes Coalition to Address New FAA 5G “Upper C-Band” Mandates
The Shift to Upper C-Band: A New Technical Challenge
The “Solutions Gap”
Timelines and Compliance Deadlines
AirPro News Analysis: Legislating Physics
Industry Collaboration Efforts
Frequently Asked Questions
Which aircraft are affected by the new rule?
When must business jets comply?
Why can’t operators just use the filters installed in 2023?
NBAA Statement on 5G Interference
Federal Aviation Administration (NPRM Filings)
Photo Credit: NBAA
Business Aviation
IRS Expands 100 Percent Bonus Depreciation for Business Aircraft
IRS Notice 2026-11 clarifies 100% bonus depreciation eligibility for business aircraft delivered after January 19, 2025, benefiting accrual-basis taxpayers.
On January 14, 2026, the Internal Revenue Service (IRS) issued Notice 2026-11, providing critical interim guidance regarding the “One Big Beautiful Bill Act” (OBBBA). This legislation, signed into law in July 2025, permanently reinstated 100% bonus depreciation for qualified property, including business aircraft, acquired and placed in service after January 19, 2025.
According to an industry update published by the National Business Aviation Association (NBAA), the new guidance offers a significant technical clarification that could save aircraft buyers millions in tax liability. Specifically, the guidance addresses the treatment of “binding written contracts,” potentially allowing taxpayers who ordered aircraft under previous, less favorable tax rules to qualify for the full 100% deduction upon delivery.
Under the Tax Cuts and Jobs Act (TCJA) of 2017, bonus depreciation was scheduled to phase down. For the 2025 tax year, the deduction was set to drop to 40% generally, or 60% for certain aircraft with longer production periods. Many buyers signed binding purchase contracts in 2024 or early 2025 expecting these lower rates.
Typically, tax rules consider property “acquired” on the date a binding written contract is signed. This created a potential trap: buyers who signed contracts before the new law took effect (on or before January 19, 2025) but took delivery afterward might have been locked into the lower phase-down rates.
The NBAA reports that Notice 2026-11 provides a vital workaround. The guidance clarifies that for accrual-basis taxpayers, a category that includes most corporations and large flight departments, the acquisition can effectively be treated as occurring upon delivery or title transfer.
Consequently, a buyer with a contract from 2024 who took delivery on January 25, 2025, may now claim 100% depreciation rather than the previously expected 40% or 60%. However, the NBAA notes that cash-basis taxpayers face a more difficult hurdle, as they recognize expenses when cash is paid, potentially leaving them subject to older rates if significant payments were made prior to the cutoff.
“Business aircraft owners require a detailed factual analysis in order to present accurate tax returns. There are advanced technical positions that support eligibility for 100% bonus depreciation…”
, David Shannon, Partner at Lewis Brisbois (via NBAA)
While the return of 100% bonus depreciation is generally welcomed, the IRS guidance also outlines a “Transition Election” allowing taxpayers to opt for the lower rates. According to the research data, taxpayers can choose to apply the 40% rate (or 60% for longer-production aircraft) for the first tax year ending after January 19, 2025.
Tax experts suggest this counterintuitive move may be vital for specific tax planning strategies:
We believe this guidance will have an immediate stabilizing effect on the pre-owned and new aircraft markets in Q1 2026. Throughout late 2025, uncertainty regarding the “binding contract” rule likely caused hesitation among buyers who were unsure if their transactions would qualify for the reinstated OBBBA benefits.
With the IRS confirming that delivery dates can supersede contract dates for accrual-basis taxpayers, we expect a flurry of retroactive tax planning for 2025 returns. Furthermore, the permanent nature of the 100% deduction removes the “use it or lose it” pressure that defined the previous phase-out era, likely leading to more consistent, sustainable demand rather than artificial year-end spikes.
What is the effective date for the new 100% bonus depreciation? Does this apply to contracts signed in 2024? Can I still choose the 60% rate?
IRS Guidance Expands 100% Bonus Depreciation Eligibility for Aircraft Owners
The “Binding Contract” Trap and the New Solution
Relief for Accrual-Basis Taxpayers
Strategic Elections: When to Take Less
AirPro News Analysis
Frequently Asked Questions
The 100% rate applies to qualified property acquired and placed in service after January 19, 2025.
Potentially. According to the new guidance, accrual-basis taxpayers who took delivery after January 19, 2025, may qualify for the 100% rate even if the contract was signed earlier. Consultation with a tax professional is required.
Yes. The guidance allows for a “Transition Election” to use the lower phase-down rates (40% or 60%) if that benefits your specific tax situation, such as preserving Net Operating Losses.
Sources
Photo Credit: NBAA
Business Aviation
Beyond Aero Validates Hydrogen Business Jet Aerodynamics in Wind Tunnel Tests
Beyond Aero completes wind tunnel tests for its hydrogen-powered business jet, confirming aerodynamic stability and advancing propulsion readiness.
On January 19, 2026, Toulouse-based manufacturers Beyond Aero announced the successful completion of a critical wind tunnel test campaign for its “One” (BYA-1) business jet. The testing, conducted at the German-Dutch Wind Tunnels (DNW) facility in Marknesse, Netherlands, serves as a primary validation of the aircraft’s novel aerodynamic architecture, specifically the integration of external hydrogen fuel tanks.
The campaign utilized a 1:8 scale model of the aircraft and spanned five weeks, generating over 60,000 data points. According to the company, these tests confirmed the stability and control of the design, validating the Computational Fluid Dynamics (CFD) models used during the preliminary engineering phase. This milestone keeps the program on track for a targeted entry into service in the early 2030s.
The primary engineering challenge addressed during this campaign was the aerodynamic impact of gaseous hydrogen storage. Unlike traditional jet fuel, which is stored in wings, hydrogen requires high-pressure tanks that occupy significant volume. Beyond Aero’s design places these tanks in fairings external to the pressurized fuselage, a configuration that frees up cabin space but introduces complex airflow considerations.
In the company’s press statement, the engineering team highlighted the necessity of this testing phase:
“Validating a hydrogen-driven aerodynamic architecture… Hydrogen propulsion introduces architectural constraints that fundamentally shape aircraft aerodynamics.”
The tests at DNW’s Low-Speed Facility (LST) focused on the interaction between the fuselage, wings, and these external nacelles. The data reportedly confirms that the aircraft maintains necessary lift and stability characteristics despite the structural modifications required for hydrogen propulsion.
The “One” is designed as a mid-size business jet falling under the CS-23 certification category. Based on the specifications released by Beyond Aero, the aircraft targets the following performance metrics:
The powertrain relies on gaseous hydrogen stored at 700 bar. The company expects to reach a design freeze by early 2027.
While the wind tunnel tests validate the airframe, Beyond Aero has also accelerated its powertrain development through strategic asset acquisitions. Following the 2024 cessation of operations by Universal Hydrogen, Beyond Aero acquired that company’s patent portfolio, flight test data, and test benches. This acquisition allowed Beyond Aero to bypass several years of research and development. In October 2025, the company announced it had achieved Technology Readiness Level 6 (TRL 6) for its propulsion system, a milestone significantly aided by the integration of the former Universal Hydrogen assets.
The successful wind tunnel campaign by Beyond Aero highlights a diverging path in the hydrogen aviation sector. While competitors like ZeroAvia have focused on retrofitting existing airframes (such as the Cessna Caravan or Dash 8) to expedite certification, Beyond Aero is pursuing a “clean-sheet” design. This approach allows for optimized integration of hydrogen tanks, arguably the most difficult physical constraint of hydrogen aviation, but it carries the higher capital risk and longer timelines associated with certifying a brand-new airframe.
Furthermore, the regulatory landscape remains a significant hurdle. The “One” is set to be certified under EASA CS-23 regulations, but current standards do not explicitly cover hydrogen electric propulsion. Beyond Aero’s “Pre-Application Contract” (PAC) with EASA suggests they are positioning themselves as a regulatory pathfinder, helping to define the “Special Conditions” required for future hydrogen aircraft. The successful aerodynamic validation of external tanks is a crucial step in proving to regulators that hydrogen infrastructure can be safely integrated into a certified airframe without compromising flight characteristics.
Wind Tunnel Success Marks Milestone for Hydrogen Business Aviation
Validating the “One” Architecture
Aircraft Specifications and Performance
Strategic Acceleration via Acquisition
AirPro News Analysis
Sources
Photo Credit: Beyond Aero
Business Aviation
REGENT Secures 30 Viceroy Seaglider Order from XXV for US East Coast
REGENT’s 30-unit Viceroy seaglider order from XXV aims to launch a zero-emission, high-speed transport network along the U.S. East Coast by 2027.
This article is based on an official press release from REGENT.
Rhode Island-based manufacturers REGENT has announced a significant fleet order from XXV, a private membership club headquartered in Southern Connecticut. The agreement includes a firm order for 30 “Viceroy” seagliders, the all-electric wing-in-ground effect vehicles designed to operate exclusively over water.
According to the company’s announcement, the partnership aims to establish a high-speed, zero-emission transportation network connecting key luxury destinations along the U.S. East Coast. Deliveries are scheduled to begin as early as 2027, potentially positioning the service ahead of many electric vertical takeoff and landing (eVTOL) air taxi competitors.
While the financial terms were not disclosed in the official release, market analysis of comparable orders, such as previous deals with Southern Airways Express and Ocean Flyer, suggests the total value of the 30-unit fleet could range between $300 million and $500 million.
XXV plans to deploy the Viceroy seagliders on some of the most congested and lucrative travel corridors in the United States. The press release confirms that the planned route network will service:
The service targets the same demographic currently served by helicopter operators like Blade and seaplane operators like Tailwind Air, but with a promise of reduced noise and zero operating emissions. XXV stated that it intends to appoint a “high-profile U.S. operator” to manage the daily logistics and piloting of the fleet, rather than operating the vessels directly.
“We designed Seaglider vessels to remove friction from coastal travel, and XXV is applying that capability to create a member experience centered on our shared goals of convenience, comfort, and connection.”
, Billy Thalheimer, CEO of REGENT
The purchaser, XXV (pronounced “Twenty-Five”), is described as a private members club founded by Neill Etheridge and Jamie Petty. Despite the scale of the order, the organization maintains a low public profile, with no active public-facing membership portal currently available. The club positions itself as a provider of “innovative experiences centered around premier coastal destinations.”
In a statement regarding the acquisition, co-founder Neill Etheridge emphasized the transformative potential of the technology. “REGENT’s Seaglider vessels transform travel from a constraint into an opportunity.”
, Neill Etheridge, Co-founder of XXV
The Viceroy is a 12-passenger, all-electric craft capable of speeds up to 180 mph (156 knots). It operates using the “wing-in-ground” (WIG) effect, flying on a cushion of air within one wingspan of the water’s surface. Because the vehicle never flies at high altitudes, it is classified as a maritime vessel by the U.S. Coast Guard (USCG) rather than an aircraft by the FAA.
This classification is critical to the project’s timeline. By adhering to maritime regulations, REGENT aims to bypass the lengthy and expensive certification backlog currently facing electric aviation startups. The Viceroy operates in three modes: floating on its hull near docks, hydrofoiling in harbors, and flying at low altitude over open water.
The order from XXV highlights a growing trend of private capital seeking to disrupt regional mobility through “regulatory arbitrage.” By utilizing the USCG maritime classification, operators like XXV can potentially launch high-speed regional services years before FAA-certified electric air taxis enter the market.
However, challenges remain. While the “boat” classification simplifies certification, the operational reality of flying a vehicle at 180 mph near crowded waterways like New York Harbor will likely invite scrutiny. Furthermore, the viability of the network depends on the installation of high-voltage maritime charging infrastructure at destinations like Nantucket and the Hamptons, which is currently virtually non-existent.
If successful, this model poses a direct threat to existing helicopter services. The Viceroy promises a smoother ride than traditional boats and a significantly quieter acoustic profile than helicopters, potentially unlocking access to noise-sensitive ports that have previously banned air traffic.
Is the Viceroy a plane or a boat? When will the service launch? How fast can it go?
Stealth Private Club ‘XXV’ Orders 30 REGENT Seagliders for East Coast Service
Connecting the “Golden Routes”
The Buyer: Who is XXV?
Technology and Regulatory Strategy
AirPro News Analysis
Frequently Asked Questions
Legally, it is a boat. The U.S. Coast Guard classifies it as a maritime vessel because it operates exclusively in ground effect, just a few feet above the water.
Deliveries are scheduled to begin in 2027, though the exact launch date for passenger services will depend on operator readiness and infrastructure development.
The Viceroy has a top speed of 180 mph, making it approximately six times faster than a traditional ferry.
Sources
Photo Credit: REGENT
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