Delta flight 9E5139 triggers unstable approach flag on arrival at LaGuardia from Montreal

HEADLINE: Endeavor Air CRJ-900 flags unstable approach landing Delta flight 5139 at LaGuardia

HEADLINE: Delta flight 5139, operated by Endeavor Air, logs unstable approach into LaGuardia from Montreal

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HEADLINE: Delta flight 5139 by Endeavor Air draws unstable approach flag at LaGuardia from Montreal

Delta flight 5139, operated by Endeavor Air (callsign EDV5139), a Bombardier CRJ-900 registered N135EV, departed Montreal-Trudeau Airport (CYUL) at 9:50 a.m. local time (13:50 UTC) on August 25, 2026, bound for New York LaGuardia (KLGA). The roughly one-hour flight reached a peak altitude of 28,747 feet while tracking southward over the Adirondack region.

SkyMeter's analysis of ADS-B tracking data shows the aircraft leveled at cruise altitude for about nine minutes before beginning a sustained descent. The track then shows two intermediate level-offs, one near 18,554 feet lasting roughly two minutes and another near 4,080 feet lasting about three minutes, followed by a series of heading changes that took the aircraft west toward LaGuardia, south toward Newark Liberty, east, and then north back toward LaGuardia, reflecting the complex arrival sequencing common in the New York terminal area.

On final approach, SkyMeter's detectors flagged an unstable approach, with a stability score of 40.1, beginning at about 10:47 a.m. local time. The track shows the aircraft descending through 1,266 feet at roughly 930 feet per minute while on a heading of 74 degrees, with subsequent rapid heading swings through north and northwest before touchdown. The aircraft landed and taxied in, with the track ending at 10:50 a.m. local time.

The full flight track for EDV5139 on August 25, 2026, including the flagged approach, can be replayed on SkyMeter.