BYF21 is operated by KOHN AVIATION LLC between San Carlos Airport (KSQL) and Hayward Executive Airport (KHWD). The flight is most often flown by a CESSNA Cessna Skyhawk 172/Cutlass. Typical block time is 0h 57m. SkyMeter has observed 187 legs of this flight number via ADS-B.

✈
FLIGHTS
187
last 90 days
⏱
AVG DURATION
57m
tracked time
📅
SERVICE PERIOD
05/27/2025 → 07/05/2026
first → last seen
🗺
ROUTES / TYPES
29 / 1
city pairs · airframes
⚠
INCIDENT RATE
19.8%
37 flagged

Routes flown

By count · last 90 days

10
KSQL → KHWD
11
avg 1h 1m · San Carlos → Hayward Executive
KSQL → KOAK
6
avg 1h 0m · San Carlos → Metropolitan Oakland
KSQL → KHAF
3
avg 41m · San Carlos → Half Moon Bay
KHAF → KSQL
3
avg 24m · Half Moon Bay → San Carlos
KSQL → KSFO
3
avg 45m · San Carlos → San Francisco
US-2359 → KSQL
2
avg 55m · San Mateo Highlands Airfield → San Carlos
KSQL → KAPC
2
avg 35m · San Carlos → Napa County
US-2776 → KSQL
2
avg 17m · Stanford Health Care West Heliport → San Carlos
KSQL → KPAO
2
avg 1h 1m · San Carlos → Palo Alto Airport of Santa Clara County
KHWD → KSQL
1
avg 27m · Hayward Executive → San Carlos

Aircraft types

Equipment used on this number

1
C172 CESSNA Cessna Skyhawk 172/Cutlass
189

Safety profile

Flagged flights · last 90 days

Go-arounds
0
Unstable approach
37
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 BYF21

30
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/05/2026
40m
△ Unstable approach
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/05/2026
42m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/05/2026
39m
△ Unstable approach
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/05/2026
39m
△ Unstable approach
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/04/2026
1h 12m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/04/2026
1h 22m
△ Unstable approach
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/03/2026
44m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/03/2026
1h 1m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/03/2026
1h 23m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/02/2026
2h 7m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/01/2026
35m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/01/2026
1h 18m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/01/2026
1h 4m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
07/01/2026
1h 12m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/30/2026
1h 9m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/30/2026
58m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/30/2026
1h 3m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/29/2026
1h 11m
△ Unstable approach
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/28/2026
1h 3m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/27/2026
1h 1m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/26/2026
26m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/25/2026
1h 33m
△ Unstable approach
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/25/2026
18m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/25/2026
1h 46m
△ Unstable approach
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/24/2026
55m
△ Unstable approach
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/24/2026
55m
△ Unstable approach
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/24/2026
1h 2m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/24/2026
1h 24m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/24/2026
19m
No alerts
Replay Analysis
N21591CESSNA Cessna Skyhawk 172/Cutlass
→
06/23/2026
58m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window