2. Fokker S-14 'K-1' flown by Prince Bernhard of The Netherlands' personal pilot Gerben Sonderman in the 1955 Lockheed Aerobatic Trophy 19-20 August. (Nostalgic chorus of 'Ah, the Lockheed!'). Sonderman suffered an engine failure while inverted during his opening day's sequence, deadsticked the S-14 and was eliminated by the judges. Frenchman Alain Hisler placed second that year in the Sipa Minijet, between fellow countrymen winner (the great) Leon Biancotto and d'Huc Dressler, both Stampe-mounted.
3. Soviet Union. MiG I-200 (prototype MiG-9) and Yak-15. Both ready to fly at Chkalovskaya Flight Test Centre on 24 April 1946, to be flown respectively by 'Lesha' Grinchik and Mikhail Ivanov. Tossed coin for first to fly, Grinchik won, Ivanov followed.
JDK: can I add one? Which jet-engined aircraft made the first arrested landing on a carrier's deck? I had cause to check this just this past week, and found that the answer wasn't what I'd expected.