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.

REPUBLIC · FLIGHT YX 4727 LANDED 11:50 PM ET, ~15 MIN LATE · SCHEDULED TIME UNKNOWN

Tuesday, September 29

YX 4727 · STL → BOS

took off 8:21 PM CT · landed 11:50 PM ET (scheduled time unknown)

Forecast issued Tue 10:00 PM ET · 0h before departure

Arrive at BOS more than 15 minutes late?

56% chance · ±2 pts +15 pts · 24h

HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.

What’s moving the odds

↑ Cloud base down to 600 ft, visibility down to 1.5 mi forecast at BOS that day

↑ Arrivals into BOS at that hour are often late

↑ Other factors

↓ Mostly benign weather forecast at STL

↓ Tuesdays in September are usually quieter than average

Weather at each end

STL (origin) Gusts9 kt Ceilingnone (clear) Visibility10+ mi Precipnone

BOS (destination) Gusts11 kt Ceiling600 ft Visibility1.5 mi Precip0.03 in

How this resolves

Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.

Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.

YX 4727 · STL → BOS

Odds over time