Search LADD: N421FN
N421FN is on the LADD list. So it is 'blocked'

Any site that uses FAA data is required to block this aircraft, ie. FlightRadar24, FlightAware. You can still track it on TheAirTraffic.com though.
Seen on LADD before we began logging dates.Last Seen on LADD: 2025-05-13
N421FN is not on LADD Source block list as of last check on 2023-01-09
Aircraft Info: N421FN
ICAO: a4ffe0
ICAO Type: C421
Manufacturer: CESSNA
Model: 421C
Year: 1978
Owner: KEYS AVIATION LLC
Military: False