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 1571 LANDED 12:27 PM ET, ~13 MIN LATE · SCHEDULED TIME UNKNOWN

AA 1571 · LGA → BOS

took off 11:48 AM ET · landed 12:27 PM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 10h after departure

Odds over time

Arrive at BOS more than 15 minutes late?
39% chance · ±0 pts −2 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% 2.5d 2d 1d 12h 6h Departs