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.

ALLEGIANT · FLIGHT G4 1884 LANDED 10:17 AM ET, ~10 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

G4 1884 · AVL → BOS

took off 8:35 AM ET · landed 10:17 AM ET (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 13h after departure

Odds over time

Arrive at BOS more than 15 minutes late?
15% chance · ±0 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 5% 10% 15% 20% 2h Departs Lands