The U.S. had not committed to giving Ukraine its F-16s, but images of the type being flown out of Arizona on a Ukrainian An-124 began circulating last week. The non-operational F-16s appear to be the first examples supplied directly to Ukraine from U.S. stocks.
Engine swapped F-16 drag race
Awhile back there was an experimental Concorde engine with afterburner for sale on eBay.