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.

JETBLUE · FLIGHT B6 2260 LANDED 4:15 PM ET, ~14 MIN EARLY · SCHEDULED TIME UNKNOWN
Yesterday

B6 2260 · MAD → BOS

took off 2:45 PM CEST · landed 4:15 PM ET (scheduled time unknown)
Forecast issued Tue 5:00 PM ET · 8h after departure

Odds over time

Arrive at BOS more than 15 minutes late?
24% chance · ±1 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% 7h 6h Departs Lands