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 101 LANDED 1:11 PM ET, ~8 MIN LATE · SCHEDULED TIME UNKNOWN

AA 101 · LHR → JFK

took off 10:59 AM BST · landed 1:11 PM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 16h after departure

Odds over time

Arrive at JFK more than 15 minutes late?
11% chance · ±0 pts +1 pt · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 5% 10% 15% 20% 15h 12h 6h Departs Lands