Unstable approach — UAL520

UAL520 (United Airlines) was operating from KSFO to KISM on 2026-07-25. SkyMeter detected a low approach-stability score at Kissimmee Gateway Airport (KISM) on runway 15 at 02:17 UTC. Trace data at the event: 1178 ft AGL, 157 kt GS. METAR at the time reported 7 kt wind, 5 kt crosswind component, 16,093 m visibility. The approach-stability score rates the final approach against stabilized-approach gates (glideslope, lateral deviation, descent rate, and IAS) at defined altitudes. A low score means one or more of those were outside the normal envelope for how the approach was flown. The score is graded by guidance type, so instrument approaches (ILS or an aligned straight-in) are held to the full gate set, while visual and pattern arrivals are surfaced only when the score is clearly low. The score is advisory and observational, a deviation measure, not an assertion of an accident. Detection algorithm and known limitations: see SkyMeter methodology.

• SECURITY6/4165 2026-02-14 07:00Z – 2026-08-15 06:59Z SFC–400 ft

  Nogales, AZ, Saturday, February 14, 2026 through Friday, August 14, 2026 Local

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• SECURITY6/4160 2026-02-14 08:00Z – 2026-08-15 06:59Z SFC–400 ft

  Chula Vista, CA, Saturday, February 14, 2026 through Friday, August 14, 2026 Local

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• 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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• SECURITY6/2657 2026-07-05 00:01Z – 2027-01-02 23:59Z SFC–500 ft

  Calexico, CA, Saturday, July 4, 2026 through Saturday, January 2, 2027 Local

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• SECURITY6/2656 2026-07-05 00:01Z – 2027-01-02 23:59Z SFC–500 ft

  Coyote Wells, CA, Saturday, July 4, 2026 through Saturday, January 2, 2027 Local

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• SECURITY6/2652 2026-07-05 00:01Z – 2027-01-02 23:59Z SFC–500 ft

  Coyote Wells, CA, Saturday, July 4, 2026 through Saturday, January 2, 2027 Local

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• HAZARDS6/4895 2026-07-10 23:19Z – 2026-07-24 23:00Z SFC–10,500 ft

  3NM W PIÑON HILLS, CA, Friday, July 10, 2026 through Friday, July 24, 2026 UTC

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• HAZARDS6/4907 2026-07-11 15:00Z – 2026-07-24 23:00Z SFC–10,500 ft

  3NM W PIÑON HILLS, CA, Saturday, July 11, 2026 through Friday, July 24, 2026 UTC

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• HAZARDS6/5145 2026-07-13 00:57Z – 2026-07-26 07:45Z SFC–8,500 ft

  3NM W PIÑON HILLS, CA, Monday, July 13, 2026 through Sunday, July 26, 2026 UTC

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• HAZARDS6/5450 2026-07-14 04:00Z – 2026-07-29 04:00Z SFC–16,500 ft

  19NM NE OURAY, CO, Tuesday, July 14, 2026 through Wednesday, July 29, 2026 UTC

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• HAZARDS6/5451 2026-07-14 04:00Z – 2026-07-29 04:00Z SFC–16,500 ft

  1NM N OURAY, CO, Tuesday, July 14, 2026 through Wednesday, July 29, 2026 UTC

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• SECURITY6/4812 2026-07-15 07:00Z – 2027-07-14 06:59Z SFC–17,999 ft

  El Centro, CA, Wednesday, July 15, 2026 through Tuesday, July 13, 2027 Local

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• HAZARDS6/6360 2026-07-17 04:00Z – 2026-07-30 04:00Z SFC–15,000 ft

  9NM SW PUEBLO, CO, Friday, July 17, 2026 through Thursday, July 30, 2026 UTC

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• HAZARDS6/6395 2026-07-17 12:00Z – 2026-07-30 04:00Z SFC–13,000 ft

  14NM N CORTEZ, CO, Friday, July 17, 2026 through Thursday, July 30, 2026 UTC

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• HAZARDS6/6186 2026-07-17 13:00Z – 2026-07-30 03:00Z SFC–11,000 ft

  21NM NE DOUGLAS, AZ, Friday, July 17, 2026 through Thursday, July 30, 2026 UTC

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• HAZARDS6/6359 2026-07-17 14:00Z – 2026-07-31 03:00Z SFC–15,500 ft

  5NM E BEAVER, UT, Friday, July 17, 2026 through Friday, July 31, 2026 UTC

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• HAZARDS6/6567 2026-07-18 13:00Z – 2026-08-01 04:00Z SFC–16,000 ft

  16NM W MONTICELLO, UT, Saturday, July 18, 2026 through Saturday, August 1, 2026 UTC

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• HAZARDS6/6569 2026-07-18 14:00Z – 2026-07-31 03:00Z SFC–15,500 ft

  5NM E BEAVER, UT, Saturday, July 18, 2026 through Friday, July 31, 2026 UTC

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• HAZARDS6/6736 2026-07-19 12:00Z – 2026-08-01 03:00Z SFC–16,000 ft

  16NM W MONTICELLO, UT, Sunday, July 19, 2026 through Saturday, August 1, 2026 UTC

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• SECURITY6/6491 2026-07-20 07:01Z – 2026-09-16 06:59Z SFC–1,499 ft

  Concord, CA, Monday, July 20, 2026 through Tuesday, September 15, 2026 Local

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• HAZARDS6/6876 2026-07-20 13:00Z – 2026-08-03 04:00Z SFC–16,000 ft

  7NM SW DEL NORTE, CO, Monday, July 20, 2026 through Monday, August 3, 2026 UTC

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• HAZARDS6/7246 2026-07-21 05:00Z – 2026-08-21 03:00Z SFC–10,500 ft

  20NM N INDEPENDENCE, CA, Tuesday, July 21, 2026 through Friday, August 21, 2026 UTC

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• HAZARDS6/7372 2026-07-21 13:38Z – 2026-08-22 03:00Z SFC–10,500 ft

  20NM N INDEPENDENCE, CA, Tuesday, July 21, 2026 through Saturday, August 22, 2026 UTC

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• HAZARDS6/7909 2026-07-22 18:11Z – 2026-08-08 04:00Z SFC–12,500 ft

  20NM N INDEPENDENCE, CA, Wednesday, July 22, 2026 through Saturday, August 8, 2026 UTC

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• HAZARDS6/8008 2026-07-23 12:00Z – 2026-08-01 03:00Z SFC–12,000 ft

  16NM W MONTICELLO, UT, Thursday, July 23, 2026 through Saturday, August 1, 2026 UTC

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• HAZARDS6/8010 2026-07-23 12:00Z – 2026-08-12 04:00Z SFC–16,500 ft

  19NM NE OURAY, CO, Thursday, July 23, 2026 through Wednesday, August 12, 2026 UTC

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• HAZARDS6/8012 2026-07-23 12:00Z – 2026-08-12 04:00Z SFC–16,500 ft

  1NM N OURAY, CO, Thursday, July 23, 2026 through Wednesday, August 12, 2026 UTC

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• SECURITY6/7911 2026-07-24 16:30Z – 2026-07-27 02:00Z SFC–400 ft

  San Diego, CA, Friday, July 24, 2026 through Sunday, July 26, 2026 Local

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• SECURITY6/7832 2026-07-24 23:07Z – 2026-07-24 23:59Z SFC–400 ft

  Pell City, AL

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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