ATAC operates a mix of Hunters, Kfirs and Drakens out of Virginia. They do a ton of contract DACT for the USN, but appear all over the US flying for hire.
ATSI was the largest non-military operator of the A-4 Skyhawk. They purchased several jets from the IDF and were a contract "Aggressor" force. They had a few crashes and I haven't heard much about them being hired by the military since. Boeing does use them as chase aircraft for the KC-767 program. Some of their A-4Ns are leased by BAe for target tug duties in Europe.
Historic Flight Foundation out of Washington State already owns a MiG-29UB and several other EastBloc jets, so maybe it went to them?