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.

ALASKA · FLIGHT AS 214 LANDED 8:07 AM ET, ~29 MIN LATE · SCHEDULED TIME UNKNOWN

AS 214 · SEA → BOS

took off 12:26 AM PT · landed 8:07 AM ET (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 19h after departure

Odds over time

Arrive at BOS more than 15 minutes late?
24% chance · ±0 pts +0 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 10% 20% 30% 40% 3h Departs Lands