Squawk 7500 transmission — UAL631

UAL631 (United Airlines) was operating from KMSY to KDEN on 2026-04-23. SkyMeter recorded a 7500 transponder transmission at 15:53 UTC. Code 7500 indicates unlawful interference; in practice the overwhelming majority of observed transmissions are transponder glitches, mode-select knob errors, or transient ADS-B noise rather than a declared hijack. SkyMeter records the signal; it does not claim a hijack occurred. Trace data at the event: 37263 ft AGL, 429 kt GS. METAR at the time reported 8 kt wind, 1 kt crosswind component. Detection algorithm and known limitations: see SkyMeter methodology.

• SECURITY6/4240 2026-03-08 08:00Z – 2026-11-01 07:00Z SFC–180 ft

  SAN ANGELO, TX, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local

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SkyMeter cross-referenced this flight against FAA-published TFRs that were active during its window and within its geographic bounding box. Overlap doesn't necessarily mean violation — the aircraft may have been outside the TFR’s precise polygon or flying under air-traffic-control coordination.

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Automated analysis. Events shown on this page (such as go-around, unstable approach, or runway events) are heuristic classifications produced by algorithms from publicly broadcast ADS-B data. They are intended to surface flights of interest for further review — they are not findings of fact, and they do not determine pilot fault, regulatory compliance, or the cause of any occurrence. Coverage gaps and sensor noise can affect accuracy. Only the relevant civil aviation authority or accident investigation body can make official determinations. How we detect events · Dispute or correct this data