Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI9O callsign genealogy
Currently held by JACOBSEN, ERIK H
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 AI9O's current licensee, walking backwards.
- Reid, David MILgranted 2024-10-05cancelled 2026-03-17
Successor callsigns
Callsigns held now by people who previously held AI9O.
- JACOBSEN, ERIK HTXgranted 2024-02-24
All historical holders
Every license row we've seen with the callsign AI9O, oldest first.
- MATASSA, RICHARD N IL2004-03-11 → cancelled 2016-03-30
- JACOBSEN, ERIK H TX2016-04-19 → cancelled 2024-02-24
- Reid, David M IL2026-03-17 active