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 3258 LANDED 12:16 PM MT, ~12 MIN LATE · SCHEDULED TIME UNKNOWN

AA 3258 · ORD → SLC

took off 10:28 AM CT · landed 12:16 PM MT (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 11h after departure

Odds over time

Arrive at SLC more than 15 minutes late?
63% chance · ±0 pts +15 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% 1.1d 12h 6h Departs Lands