Squawk 7700 transmission — UAL579

UAL579 (United Airlines) was operating from KIAH to MMMY on 2026-05-10. SkyMeter recorded a 7700 transponder transmission at 21:58 UTC. Code 7700 indicates a general emergency declaration (e.g. engine, medical, smoke). A sustained transmission is normally accompanied by ATC priority handling. Trace data at the event: 35082 ft AGL, 490 kt GS. METAR at the time reported 3 kt wind, 1 kt crosswind component. Detection algorithm and known limitations: see SkyMeter methodology.

• SECURITY5/6914 2025-05-06 23:30Z – 2027-10-18 11:03Z SFC–6,000 ft

  South Padre Island, TX, Tuesday, May 6, 2025 Local

  View FAA NOTAM →
• SECURITY5/3678 2026-01-01 05:00Z – 2027-01-01 05:59Z SFC–2,000 ft

  Brownsville, TX, Thursday, January 1, 2026 through Friday, January 1, 2027 Local

  View FAA NOTAM →
• SECURITY5/3679 2026-01-01 05:00Z – 2027-01-01 05:59Z SFC–5,000 ft

  Brownsville, TX, Thursday, January 1, 2026 through Friday, January 1, 2027 Local

  View FAA NOTAM →

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.

All events on this flight

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