ASA421 is operated by ALASKA AIRLINES INC between Seattle Tacoma International Airport (KSEA) and Fairbanks International Airport (PAFA). The flight is most often flown by a BOEING Boeing 737 MAX 9. Typical block time is 3h 9m. SkyMeter has observed 23 legs of this flight number via ADS-B.

✈
FLIGHTS
23
last 90 days
⏱
AVG DURATION
3h 9m
tracked time
📅
SERVICE PERIOD
04/17/2026 → 06/03/2026
first → last seen
🗺
ROUTES / TYPES
3 / 4
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

2
KSEA → PAFA
2
avg 3h 45m · Seattle Tacoma → Fairbanks
KSEA → KLAX
1
avg 8h 17m · Seattle Tacoma → Los Angeles

Aircraft types

Equipment used on this number

4
B39M BOEING Boeing 737 MAX 9
14
B738 BOEING Boeing 737-800
4
B739 BOEING Boeing 737-900
4
B38M BOEING Boeing 737 MAX 8
1

Safety profile

Flagged flights · last 90 days

Go-arounds
0
Unstable approach
0
Rejected TO
0
Stall warnings
0
Overspeeds
0
Runway excursion
0
Counts represent flights with at least one occurrence of each flag, not the total event count. See /incidents for individual events.

Recent flights

Newest 23 operations of ASA421

23
N719ALBOEING Boeing 737 MAX 9
→
06/03/2026
3h 6m
No alerts
Replay Analysis
N565ASBOEING Boeing 737-800
→
06/02/2026
2h 55m
No alerts
Replay Analysis
N956AKBOEING Boeing 737 MAX 9
→
06/01/2026
2h 34m
No alerts
Replay Analysis
N969AKBOEING Boeing 737 MAX 9
→
05/31/2026
2h 42m
No alerts
Replay Analysis
N903AKBOEING Boeing 737 MAX 9
→
05/29/2026
1h 43m
No alerts
Replay Analysis
N920AKBOEING Boeing 737 MAX 9
→
05/28/2026
2h 46m
No alerts
Replay Analysis
N587ASBOEING Boeing 737-800
→
05/27/2026
2h 40m
No alerts
Replay Analysis
N963AKBOEING Boeing 737 MAX 9
→
05/26/2026
2h 40m
No alerts
Replay Analysis
N459ASBOEING Boeing 737-900
→
05/25/2026
2h 39m
No alerts
Replay Analysis
N983AKBOEING Boeing 737 MAX 9
→
05/24/2026
2h 45m
No alerts
Replay Analysis
N952AKBOEING Boeing 737 MAX 9
→
05/23/2026
2h 44m
No alerts
Replay Analysis
N532ASBOEING Boeing 737-800
→
05/21/2026
2h 35m
No alerts
Replay Analysis
N733ALBOEING Boeing 737 MAX 9
→
05/20/2026
3h 9m
No alerts
Replay Analysis
N990AKBOEING Boeing 737 MAX 9
→
05/18/2026
3h 5m
No alerts
Replay Analysis
N493ASBOEING Boeing 737-900
→
05/17/2026
2h 16m
No alerts
Replay Analysis
N903AKBOEING Boeing 737 MAX 9
→
05/15/2026
3h 15m
No alerts
Replay Analysis
N990AKBOEING Boeing 737 MAX 9
→
04/25/2026
3h 31m
No alerts
Replay Analysis
N816AKBOEING Boeing 737 MAX 8
→
04/23/2026
3h 59m
No alerts
Replay Analysis
N958AKBOEING Boeing 737 MAX 9
→
04/21/2026
8h 16m
No alerts
Replay Analysis
N278AKBOEING Boeing 737-900
→
04/20/2026
3h 24m
No alerts
Replay Analysis
N248AKBOEING Boeing 737-900
→
04/19/2026
3h 22m
No alerts
Replay Analysis
N562ASBOEING Boeing 737-800
→
04/18/2026
3h 14m
No alerts
Replay Analysis
N926AKBOEING Boeing 737 MAX 9
→
04/17/2026
3h 6m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window