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.

CAPE AIR · FLIGHT 9K 5161 LANDED 3:43 PM ET, ~8 MIN LATE · SCHEDULED TIME UNKNOWN
Today

9K 5161 · ACK → BOS

took off 2:38 PM ET · landed 3:43 PM ET (scheduled time unknown)
Forecast issued Mon 4:00 PM ET · 1h after departure

Odds over time

Arrive at BOS more than 15 minutes late?
25% chance · ±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% 4h Departs Lands