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 4754 LANDED 10:08 AM ET, ~1 MIN LATE · SCHEDULED TIME UNKNOWN

YX 4754 · LGA → DCA

took off 9:26 AM ET · landed 10:08 AM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 13h after departure

Odds over time

Arrive at DCA more than 15 minutes late?
26% chance · ±0 pts +8 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 10% 20% 30% 40% 18h 12h 6h Departs Lands