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 1263 LANDED 7:49 AM CT, ~16 MIN LATE · SCHEDULED TIME UNKNOWN
Today

AA 1263 · LGA → ORD

took off 6:57 AM ET · landed 7:49 AM CT (scheduled time unknown)
Forecast issued Wed 8:00 PM ET · 13h after departure

Odds over time

Arrive at ORD more than 15 minutes late?
48% chance · ±0 pts +24 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 20% 40% 60% 80% 1.0d 12h 6h Departs Lands