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.

AMERICAN · FLIGHT AA 1264 LANDED 8:39 AM ET, ~6 MIN LATE · SCHEDULED TIME UNKNOWN

AA 1264 · ORD → LGA

took off 6:06 AM CT · landed 8:39 AM ET (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 15h after departure

Odds over time

Arrive at LGA more than 15 minutes late?
30% chance · ±0 pts +19 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% 1.0d 12h 6h Departs Lands