Dassault/Dornier Alpha Jet (France/Germany) ✈ FMA IA 63 PAMPA(ARGENTINA) ✈ PZL I-22 Iryda (Poland) ✈ KAwasaki t-4 (JAPAN)

Dassault/Dornier Alpha Jet (FRANCE/GERMANY). First flight: 26 October 1973 (WIKI)

FMA IA 63 Pampa(Argentina). First flight: 6 October 1984 (WIKI)

Although influenced by the Dassault/Dornier Alpha Jet design, the Pampa differs in being a smaller aircraft, it is also single-engined and has straight supercritical wings rather than the swept ones of the Alpha Jet
— Wikipedia

PZL I-22 IRYDA (POLAND). First flight: 3 March 1985 (WIKI)

KAWASAKI T-4 (JAPAN).  First flight July 29, 1985 (WIKI)

Messerschmitt P.1101 (Germany) ✈ Bell X-5 (USA)

Messerschmitt P.1101 (Germany), 1944. Prototype - Never flown (Wiki)


Bell X-5 (USA). First flight: 20 June 1951 (Wiki)

[...] Later the prototype was shipped first to Wright Patterson AFB, then to the Bell Aircraft Works in Buffalo, New York in 1948. Damage ruled out any possibility for repair although some of the Me P.1101’s design features were subsequently used by Bell as the basis for the Bell X-5, which was the first aircraft capable of varying its wing geometry while in flight.
— Wikipedia