Diversion — UAL3917

KONT · 08R

2026-08-21 15:08 UTC· KIAH → KONT· UNITED AIRLINES INC· B739

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UAL3917 (United Airlines) was operating from KIAH to KPHX (Phoenix Sky Harbor International Airport) on 2026-08-21. SkyMeter detected a diversion to Ontario International Airport (KONT) on runway 08R at 15:08 UTC. Peak cruise altitude FL425, turnaround area near Chaparral, US. METAR at the time reported 1 kt wind, 1 kt crosswind component, 16,093 m visibility. Detection algorithm and known limitations: see SkyMeter methodology.

Active FAA TFR during this flight

Source: FAA TFR archive (hourly snapshot)
  • 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

    View FAA NOTAM →
  • 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

    View FAA NOTAM →
  • 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

    View FAA NOTAM →
  • 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

    View FAA NOTAM →
  • 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

    View FAA NOTAM →
  • HAZARDS6/5474 2026-08-17 07:41Z – 2026-08-22 00:15Z SFC–5,000 ft

    IMPERIAL, CA, Monday, August 17, 2026 through Saturday, August 22, 2026 UTC

    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.

Pilot review data

  • Runway 08R
  • 924 ft AGL at event
  • 120 kt ground speed
  • 0 fpm vertical
  • 1 kt wind
  • 1 kt crosswind component
  • 16,093 m visibility
  • KONT 161153Z 01003KT 10SM BKN019 BKN026 18/15 A2995 RMK AO2 SLP129 T01780150 10194 20172 55001 $

Flight context

  • UAL3917
  • United Airlines
  • B739
  • KIAH → KONT
  • 2026-08-21 15:08 UTC
  • KONT runway 08R

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

SkyMeter · trace data observed via ADS-B· KONT