Flight number record

OO 3986

SkyWest Airlines · Kalamazoo to Detroit

Route: AZO → DTW
Departs: 11:50
Flights: 329
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3986, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.

OO 3986 lands a B, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 329 flights, with a median arrival 10 minutes early.

On time

77.3%

Arrivals under 15 minutes late, of 321 completed flights

Avg delay

114 min

Across delayed arrivals only, not all flights

Cancelled

2.43%

National rate is 1.81%

1 hour+ late

15.6%

National rate is 8.1%

These figures cover 329 flights between July 2025 and June 2026. Beyond the headline rate, 15.6% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 3986 flies

OO 3986 flies AZO to DTW without a single fixed slot. Its most common scheduled departure was 11:50, used on 51 of 329 flights, with 12:30 (49 flights) and 12:04 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:5051 flights15.5%
Departs 12:3049 flights14.9%
Departs 12:0449 flights14.9%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 11:50 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 3986 runs level with that at 77.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 3986 next to AZO to DTW

Every carrier on AZO to DTW combined arrived on time 76.8% of the time across 995 flights, so OO 3986 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 2 points.

OO 3986 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3986thin sample	329	77.3%	114 min	2.43%	B
All SkyWest Airlines on AZO–DTW	995	76.8%	121 min	1.71%	B
All carriers on AZO–DTW	995	76.8%	121 min	1.71%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3986 quarter by quarter

OO 3986 did not run the same all year. Its best quarter was Oct–Dec 2025 at 91.1% on time and its weakest Jan–Mar 2026 at 59.0%, a swing of 32 points on roughly 82 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202592 flights79.3%
Oct–Dec 202560 flights91.1%
Jan–Mar 202686 flights59.0%
Apr–Jun 202691 flights83.3%

Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3986 ranged from 73.9% on Friday to 85.7% on Saturday. With about 47 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 3986 runs late

One category carries most of the weight here. Carrier accounts for 79% of the 8,300 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
79%
Extreme weather
18%
National Airspace System
4%

Extreme weather accounts for 18% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.8 times the usual weather exposure. The split is drawn from 8,300 delay minutes reported on OO 3986.

Cancellations sit at 2.43% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 15.6% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

OO 3986 is not only a AZO to DTW flight. It also flew DTW to AZO (329 flights, 77.2% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 329 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

Other routes flown as OO 3986
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
DTW to AZOthin sample	329	77.2%	99 min	2.43%	B

What to do with this

Booking OO 3986

For a booking, OO 3986 is a flight to put a long connection behind. 15.6% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

Where to go next

A flight number here means SkyWest Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures