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.

ENVOY · FLIGHT MQ 3989 LANDED 4:43 PM ET, ~40 MIN EARLY · SCHEDULED TIME UNKNOWN

MQ 3989 · EIS → MIA

took off 2:15 PM AST · landed 4:43 PM ET (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 7h after departure

Odds over time

Arrive at MIA more than 15 minutes late?
36% chance · ±0 pts −3 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