Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SKYWEST · FLIGHT OO 3984
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
OO 3984 · GRB → DTW
departs 6:50 AM CT · arrives 9:13 AM ET
Forecast issued Thu 4:00 AM ET · 52h before departure
Watch this flight
Other days
Today 9%
Fri 10/2 7%
Sat 10/3
Sun 10/4 6%
Mon 10/5 6%
Tue 10/6 5%
Wed 10/7 5%
Odds over time
Arrive at DTW more than 15 minutes late?
5%
chance · ±0 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
5%
Leave 15+ late
8%
Arrive 1h+ late
5%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
3%
6%
9%
12%
4.4d
Now
1d
12h
6h
Departs
Lands
Arrive at DTW more than 15 minutes late?
Calm-weather odds: 4% · changed – in 24h
–
5%
Yes 5%
No 95%
Leave GRB more than 15 minutes late?
Calm-weather odds: 6% · changed – in 24h
–
8%
Yes 8%
No 92%
Arrive at DTW more than an hour late?
Calm-weather odds: 3% · changed – in 24h
–
5%
Yes 5%
No 95%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to DTW?
On time or early
95%
15–30 min late
<1%
30 min–1 hour late
0%
1–2 hours late
1%
Over 2 hours late
3%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↓
GRB usually runs smoothly
↓
Mostly benign weather forecast at GRB
Weather at each end
GRB (origin)
Gusts 14 kt Ceiling none (clear) Visibility 10+ mi Precip none
DTW (destination)
Gusts 10 kt Ceiling none (clear) Visibility 10+ mi Precip none
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.