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.

DELTA · FLIGHT DL 1784 IN THE AIR (OFF 8:21 PM ET, ETA 11:00 PM ET) · SCHEDULED TIME UNKNOWN
Today

DL 1784 · MIA → BOS

took off 8:21 PM ET · expected to land 11:00 PM ET (scheduled time unknown)
Forecast issued Tue 8:00 PM ET · 0h before departure

Odds over time

Arrive at BOS more than 15 minutes late?
51% chance · ±0 pts +0 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 Now Departs Lands