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Grumman FF
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<p>The Grumman FF "Fifi" (company designation G-5) is an American biplane <a href="/facts/Fighter_aircraft/NuIvaGJg">fighter aircraft</a> operated by the <a href="/facts/United_States_Navy/xYK0fUou">United States Navy</a> during the 1930s. It was the first carrier aircraft with retractable landing gear. It was produced under license in Canada and known as the Goblin in Canadian service and Delfín (English: "Dolphin") in Spanish service. </p>