Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA9YY callsign genealogy
Currently held by Sheehan, Thomas E
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by AA9YY's current licensee, walking backwards.
- Yamamoto, YutakaILgranted 2024-07-17cancelled 2026-04-24
Successor callsigns
Callsigns held now by people who previously held AA9YY.
- Sheehan, Thomas EILgranted 2000-08-29cancelled 2012-08-30
All historical holders
Every license row we've seen with the callsign AA9YY, oldest first.
- Sheehan, Thomas E IL1999-07-01 → cancelled 2000-08-29
- Yamamoto, Yutaka IL2026-04-24 active