Tracked live by the FAA, but its flight plan was first seen after takeoff, so we don't know the scheduled time and can't say whether it's late.

REPUBLIC · FLIGHT YX 5779 LANDED 7:52 PM ET, ~19 MIN LATE · SCHEDULED TIME UNKNOWN

YX 5779 · IAD → JFK

took off 6:58 PM ET · landed 7:52 PM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 3h after departure

Odds over time

Arrive at JFK more than 15 minutes late?
33% chance · ±0 pts +0 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 15% 30% 45% 60% 1.2d 1d 12h 6h Departs Lands