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 2143 LANDED 5:36 PM ET, ~4 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

AA 2143 · MIA → BOS

took off 2:55 PM ET · landed 5:36 PM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 7h after departure

Odds over time

Arrive at BOS more than 15 minutes late?
58% 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% 25% 50% 75% 100% 19h 12h 6h Departs Lands