N421EF is operated by SOARING SOCIETY OF BOULDER between Boulder Municipal Airport (KBDU) and Vance Brand Airport (KLMO). The flight is most often flown by a . Typical block time is 0h 42m. SkyMeter has observed 81 legs of this flight number via ADS-B.

✈
FLIGHTS
81
last 90 days
⏱
AVG DURATION
42m
tracked time
📅
SERVICE PERIOD
6/9/2025 → 8/16/2026
first → last seen
🗺
ROUTES / TYPES
5 / 1
city pairs · airframes
⚠
INCIDENT RATE
11.1%
9 flagged

Routes flown

By count · last 90 days

4
KBDU → KLMO
8
avg 37m · Boulder → Vance Brand
KBDU → KBJC
5
avg 53m · Boulder → Rocky Mountain Metropolitan
24CO → KBDU
1
avg 45m · Ibm Building 910 Heliport → Boulder
KBDU → KEIK
1
avg 23m · Boulder → Erie

Aircraft types

Equipment used on this number

1
AS21 AS21
81

Safety profile

Flagged flights · last 90 days

Go-arounds
0
Unstable approach
9
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 N421EF

30
N421EFAS21
→
8/16/2026
23m
No alerts
Replay Analysis
N421EFAS21
→
8/16/2026
58m
△ Low approach-stability score
Replay Analysis
N421EFAS21
→
8/15/2026
32m
No alerts
Replay Analysis
N421EFAS21
→
8/13/2026
25m
No alerts
Replay Analysis
N421EFAS21
→
8/13/2026
40m
No alerts
Replay Analysis
N421EFAS21
→
8/11/2026
44m
No alerts
Replay Analysis
N421EFAS21
→
8/11/2026
42m
No alerts
Replay Analysis
N421EFAS21
→
8/7/2026
13m
No alerts
Replay Analysis
N421EFAS21
→
8/7/2026
39m
No alerts
Replay Analysis
N421EFAS21
→
8/6/2026
25m
No alerts
Replay Analysis
N421EFAS21
→
8/5/2026
37m
No alerts
Replay Analysis
N421EFAS21
→
8/5/2026
55m
No alerts
Replay Analysis
N421EFAS21
→
8/3/2026
20m
△ Low approach-stability score
Replay Analysis
N421EFAS21
→
8/3/2026
18m
No alerts
Replay Analysis
N421EFAS21
→
8/3/2026
12m
No alerts
Replay Analysis
N421EFAS21
→
8/3/2026
45m
No alerts
Replay Analysis
N421EFAS21
→
8/2/2026
1h 32m
No alerts
Replay Analysis
N421EFAS21
→
7/29/2026
43m
No alerts
Replay Analysis
N421EFAS21
→
7/26/2026
48m
No alerts
Replay Analysis
N421EFAS21
→
7/25/2026
20m
No alerts
Replay Analysis
N421EFAS21
→
7/25/2026
16m
No alerts
Replay Analysis
N421EFAS21
→
7/23/2026
19m
△ Low approach-stability score
Replay Analysis
N421EFAS21
→
7/23/2026
20m
No alerts
Replay Analysis
N421EFAS21
→
7/23/2026
34m
No alerts
Replay Analysis
N421EFAS21
→
7/23/2026
13m
No alerts
Replay Analysis
N421EFAS21
→
7/22/2026
1h 2m
No alerts
Replay Analysis
N421EFAS21
→
7/22/2026
13m
No alerts
Replay Analysis
N421EFAS21
→
7/22/2026
12m
No alerts
Replay Analysis
N421EFAS21
→
7/22/2026
20m
No alerts
Replay Analysis
N421EFAS21
→
7/16/2026
41m
△ Low approach-stability score
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window