FAA Cannot Detect GPS Spoofing In Real Time, GAO Report Finds
The finding is not that attacks happen. It is that the agency responsible has no instrument to observe one in progress, so detection is outsourced to pilot reports filed after landing, and every domestic count is therefore an estimate.
The finding is not that attacks happen. It is that the agency responsible has no instrument to observe one in progress, so detection is outsourced to pilot reports filed after landing, and every domestic count is therefore an estimate.
GAO report GAO-26-108439, released September 21, 2026, found the FAA has not finished its spectrum risk assessments and has no defined real-time capability to detect spoofing or jamming of aircraft communications.
Why it matters: Spoofing briefings, simulator retraining, diversions around affected corridors and the false terrain alerts that teach crews to discount alarms all land in fares and schedules, while the agency cannot say how often it is happening in United States airspace.
Date to watch: March 20, 2027 — the statutory deadline under 31 U.S.C. 720 for the Department of Transportation's written statement of actions on all nine recommendations.
Sources:
- GAO-26-108439, Aviation Cybersecurity (2026-09-21)
https://www.gao.gov/products/gao-26-108439 - GAO-26-108439 Highlights (2026-09-21)
https://www.gao.gov/assets/gao-26-108439-highlights.pdf - 31 U.S.C. 720, agency reporting (2026-09-21)
https://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim-title31-section720&num=0&edition=prelim - Public Law 118-159, FY2025 NDAA (2024-12-23)
https://www.congress.gov/118/plaws/publ159/PLAW-118publ159.pdf - Federal Aviation Administration (2026-09-21)
https://www.faa.gov/ - NIST SP 800-53 Rev. 5 (2020-09-23)
https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final - RTCA Special Committee 227 (2026-09-21)
https://www.rtca.org/sc-227/ - Reuters, Wyden on aircraft communications (2026-09-21)
https://kelo.com/2026/09/21/us-report-says-faa-must-better-address-threats-to-aircraft-communication/ - RTCA profile, Brent Luna, NATCA (2026-09-21)
https://www.rtca.org/people/brent-luna/ - RTCA Special Committee 159 (2026-09-21)
https://www.rtca.org/sc-159/
The Throughline decodes today's headline — with receipts. Every claim is sourced; links below.
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