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.

SKYWEST · FLIGHT OO 4778 LANDED 5:36 AM CT, ~13 MIN LATE · SCHEDULED TIME UNKNOWN

Wednesday, September 30

OO 4778 · GRR → ORD

took off 5:51 AM ET · landed 5:36 AM CT (scheduled time unknown)

Forecast issued Wed 10:00 PM ET · 16h after departure

Arrive at ORD more than 15 minutes late?

24% chance · ±0 pts +4 pts · 24h

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

What’s moving the odds

↑ OO's recent on-time record

↑ Other factors

↑ Cloud base down to 500 ft, visibility down to 1.75 mi, 0.9 in of rain forecast at ORD that day

↓ Early flights usually leave on time

↓ 5am departures from GRR are usually not late

Weather at each end

GRR (origin) Gusts11 kt Ceiling600 ft Visibility1.25 mi Precip0.35 in

ORD (destination) Gusts19 kt Ceiling500 ft Visibility1.75 mi Precip0.95 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.

OO 4778 · GRR → ORD

Odds over time