ASA21 is operated by ALASKA AIRLINES INC between John F Kennedy International Airport (KJFK) and Seattle Tacoma International Airport (KSEA). The flight is most often flown by a BOEING Boeing 737-900. Typical block time is 4h 37m. SkyMeter has observed 30 legs of this flight number via ADS-B.

✈
FLIGHTS
30
last 90 days
⏱
AVG DURATION
4h 37m
tracked time
📅
SERVICE PERIOD
04/17/2026 → 06/03/2026
first → last seen
🗺
ROUTES / TYPES
3 / 3
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

1
KJFK → KSEA
18
avg 5h 47m · John F Kennedy → Seattle Tacoma

Aircraft types

Equipment used on this number

3
B739 BOEING Boeing 737-900
32
B39M BOEING Boeing 737 MAX 9
13
B738 BOEING Boeing 737-800
3

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 30 operations of ASA21

30
N579ASBOEING Boeing 737-800
→
06/03/2026
3h 33m
No alerts
Replay Analysis
N903AKBOEING Boeing 737 MAX 9
→
06/03/2026
2h 8m
No alerts
Replay Analysis
N903AKBOEING Boeing 737 MAX 9
→
06/02/2026
5h 43m
No alerts
Replay Analysis
N903AKBOEING Boeing 737 MAX 9
→
06/02/2026
3h 34m
No alerts
Replay Analysis
N467ASBOEING Boeing 737-900
→
06/02/2026
1h 27m
No alerts
Replay Analysis
N467ASBOEING Boeing 737-900
→
06/01/2026
3h 22m
No alerts
Replay Analysis
N467ASBOEING Boeing 737-900
→
06/01/2026
5h 35m
No alerts
Replay Analysis
N919AKBOEING Boeing 737 MAX 9
→
06/01/2026
1h 34m
No alerts
Replay Analysis
N919AKBOEING Boeing 737 MAX 9
→
05/31/2026
3h 16m
No alerts
Replay Analysis
N919AKBOEING Boeing 737 MAX 9
→
05/31/2026
5h 30m
No alerts
Replay Analysis
N237AKBOEING Boeing 737-900
→
05/31/2026
3h 50m
No alerts
Replay Analysis
N267AKBOEING Boeing 737-900
→
05/29/2026
3h 19m
No alerts
Replay Analysis
N459ASBOEING Boeing 737-900
→
05/29/2026
1h 52m
No alerts
Replay Analysis
N459ASBOEING Boeing 737-900
→
05/28/2026
3h 35m
No alerts
Replay Analysis
N459ASBOEING Boeing 737-900
→
05/28/2026
5h 43m
No alerts
Replay Analysis
N479ASBOEING Boeing 737-900
→
05/28/2026
1h 42m
No alerts
Replay Analysis
N733ALBOEING Boeing 737 MAX 9
→
05/26/2026
3h 35m
No alerts
Replay Analysis
N477ASBOEING Boeing 737-900
→
05/26/2026
2h 20m
No alerts
Replay Analysis
N477ASBOEING Boeing 737-900
→
05/25/2026
3h 24m
No alerts
Replay Analysis
N477ASBOEING Boeing 737-900
→
05/25/2026
5h 45m
No alerts
Replay Analysis
N479ASBOEING Boeing 737-900
→
05/25/2026
2h 26m
No alerts
Replay Analysis
N479ASBOEING Boeing 737-900
→
05/24/2026
5h 47m
No alerts
Replay Analysis
N479ASBOEING Boeing 737-900
→
05/24/2026
3h 21m
No alerts
Replay Analysis
N492ASBOEING Boeing 737-900
→
05/24/2026
2h 28m
No alerts
Replay Analysis
N492ASBOEING Boeing 737-900
→
05/23/2026
3h 13m
No alerts
Replay Analysis
N492ASBOEING Boeing 737-900
→
05/23/2026
5h 42m
No alerts
Replay Analysis
N224AKBOEING Boeing 737-900
→
05/23/2026
1h 30m
No alerts
Replay Analysis
N224AKBOEING Boeing 737-900
→
05/22/2026
43m
No alerts
Replay Analysis
N274AKBOEING Boeing 737-900
→
05/22/2026
3h 8m
No alerts
Replay Analysis
N274AKBOEING Boeing 737-900
→
05/21/2026
2h 53m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window