That was the guess. A couple other guys thought AMX then Alpha Jet. Also I was told that they were working with something called Algonquin. Further research
Top Aces Alpha Jets maybe? They used that callsign when they were up here in Nor Cal a few months back. In fact ONT was their destination after they departed
... 266.9 then got them on 125.65 > 134.0 RECOVER ONTARIO INTL. Saw the lights as they grazed March ARB on their HDF PETIS arrival into ONT. Sounded like a