Squawk 7600 transmission — UAL1615

UAL1615 (United Airlines) was operating from KCHD to KDEN on 2026-06-21. SkyMeter recorded a 7600 transponder transmission at 20:48 UTC. Code 7600 indicates a lost-comms / NORDO state; brief transmissions are often transient radio or transponder issues that resolve without crew action. Trace data at the event: 8550 ft AGL, 272 kt GS. METAR at the time reported 5 kt wind, 4 kt crosswind component. Detection algorithm and known limitations: see SkyMeter methodology.

• SECURITY6/3948 2026-06-01 07:00Z – 2026-07-21 06:59Z

  MESA, AZ, Monday, June 1, 2026 through Tuesday, July 21, 2026 UTC

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• HAZARDS6/6608 2026-06-09 15:00Z – 2026-06-22 04:00Z SFC–11,500 ft

  13NM W NUCLA, CO, Tuesday, June 9, 2026 through Monday, June 22, 2026 UTC

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• HAZARDS6/6780 2026-06-10 13:00Z – 2026-06-22 04:00Z SFC–10,000 ft

  14NM E FLAGSTAFF, AZ, Wednesday, June 10, 2026 through Monday, June 22, 2026 UTC

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• HAZARDS6/7071 2026-06-10 13:00Z – 2026-06-23 03:00Z SFC–12,500 ft

  29NM SE GLENWOOD SPRINGS, CO, Wednesday, June 10, 2026 through Tuesday, June 23, 2026 UTC

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• HAZARDS6/7478 2026-06-11 03:12Z – 2026-06-24 04:00Z SFC–11,500 ft

  20NM N NUCLA, CO, Thursday, June 11, 2026 through Wednesday, June 24, 2026 UTC

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• HAZARDS6/7479 2026-06-11 03:19Z – 2026-06-24 04:00Z SFC–11,500 ft

  10NM NW NUCLA, CO, Thursday, June 11, 2026 through Wednesday, June 24, 2026 UTC

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• HAZARDS6/7455 2026-06-11 05:00Z – 2026-06-25 05:00Z SFC–14,000 ft

  80NM N SILVER CITY, NM, Thursday, June 11, 2026 through Thursday, June 25, 2026 UTC

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• HAZARDS6/7811 2026-06-12 03:18Z – 2026-06-25 04:00Z SFC–12,500 ft

  29NM SE GLENWOOD SPRINGS, CO, Friday, June 12, 2026 through Thursday, June 25, 2026 UTC

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• HAZARDS6/7863 2026-06-12 14:00Z – 2026-06-24 05:00Z SFC–14,000 ft

  80NM N SILVER CITY, NM, Friday, June 12, 2026 through Wednesday, June 24, 2026 UTC

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• HAZARDS6/7894 2026-06-12 14:43Z – 2026-06-25 04:00Z SFC–14,000 ft

  80NM N SILVER CITY, NM, Friday, June 12, 2026 through Thursday, June 25, 2026 UTC

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• HAZARDS6/8549 2026-06-16 02:58Z – 2026-06-30 04:00Z SFC–12,000 ft

  12NM NE GRAND JUNCTION, CO, Tuesday, June 16, 2026 through Tuesday, June 30, 2026 UTC

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• HAZARDS6/8796 2026-06-17 15:00Z – 2026-06-29 04:00Z SFC–11,500 ft

  65NM SE CEDAR CITY, UT, Wednesday, June 17, 2026 through Monday, June 29, 2026 UTC

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• HAZARDS6/9123 2026-06-18 12:00Z – 2026-06-30 05:00Z SFC–14,000 ft

  80NM N SILVER CITY, NM, Thursday, June 18, 2026 through Tuesday, June 30, 2026 UTC

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• HAZARDS6/9124 2026-06-18 14:00Z – 2026-07-01 04:00Z SFC–15,000 ft

  10NM N LOS ALAMOS, NM, Thursday, June 18, 2026 through Wednesday, July 1, 2026 UTC

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• HAZARDS6/9125 2026-06-18 14:00Z – 2026-07-02 04:00Z SFC–10,000 ft

  45NM E MESA, AZ, Thursday, June 18, 2026 through Thursday, July 2, 2026 UTC

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• HAZARDS6/9420 2026-06-20 21:25Z – 2026-07-04 04:00Z SFC–12,000 ft

  40NM SE ALBUQUERQUE, NM, Saturday, June 20, 2026 through Saturday, July 4, 2026 UTC

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• HAZARDS6/9456 2026-06-21 13:00Z – 2026-07-05 04:00Z SFC–12,000 ft

  40NM SE ALBUQUERQUE, NM, Sunday, June 21, 2026 through Sunday, July 5, 2026 UTC

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• HAZARDS6/9455 2026-06-21 14:00Z – 2026-07-05 04:00Z SFC–9,000 ft

  14NM E PAYSON, AZ, Sunday, June 21, 2026 through Sunday, July 5, 2026 UTC

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• HAZARDS6/9460 2026-06-21 14:00Z – 2026-07-04 04:00Z SFC–11,000 ft

  27NM SW PROVO, UT, Sunday, June 21, 2026 through Saturday, July 4, 2026 UTC

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• HAZARDS6/9496 2026-06-21 14:00Z – 2026-07-05 03:00Z SFC–13,000 ft

  33NM W SHOW LOW, AZ, Sunday, June 21, 2026 through Sunday, July 5, 2026 UTC

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• HAZARDS6/9545 2026-06-21 20:18Z – 2026-06-22 04:00Z SFC–10,000 ft

  16NM NE SAN CARLOS, AZ, Sunday, June 21, 2026 through Monday, June 22, 2026 UTC

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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.

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