This made me think...
Bf 109 -
first flown 1935
in service 1937
Finally retired 1965 (Spanish Service)
Served with 14 different nations, mostly Central European nations and/or former German allies in WW2. Oh, and Israel, just for the irony.
Fought in 3 wars - Spanish Civil War, WW2, first Arab-Israeli War
first flown 1936
in service 1938
Finally retired 1961 (Irish service)
Served with 33 different nations, mostly Commonwealth or WW2 allies. Oh, and Israel as well
Fought in 5 wars - WW2, first Arab-Israeli War (on both sides!), the 1947 Indo-Pakistan war, the Greek Civil War, the Malayan Emergeancy, plus it made a brief appearance in Korea (Seafires) and was an important Recon plane until the early-1950s (Swedish PR Spits regularly overflew the USSR)
IMO, these stats do reflect the fact that the Germans lost the war - Spits were popular post-war as they were plentiful, cheap and still in production. Bf 109s were not plentiful by 1945, and only the Czechs were producing any. It looks as though on the whole only those nations who were desperate (ie: Israel) bought any post-war, and only nations who couldn't afford to buy shiny new jets didn't replace them rapidly.