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.

ENDEAVOR · FLIGHT 9E 5471 LANDED 5:54 PM ET, ~6 MIN LATE · SCHEDULED TIME UNKNOWN

9E 5471 · LGA → JAX

took off 4:10 PM ET · landed 5:54 PM ET (scheduled time unknown)
Forecast issued Wed 6:00 PM ET · 2h after departure

Odds over time

Arrive at JAX more than 15 minutes late?
22% chance · ±0 pts +9 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