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.

SOUTHWEST · FLIGHT WN 3521 LANDED 5:32 PM ET, ~19 MIN LATE · SCHEDULED TIME UNKNOWN

WN 3521 · SRQ → MCO

took off 5:04 PM ET · landed 5:32 PM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 5h after departure

Odds over time

Arrive at MCO more than 15 minutes late?
15% chance · ±0 pts −8 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 10% 20% 30% 40% 1.1d 12h 6h Departs