Check the listing for details. Vintage EAA Sport Aviation Convention Program - 1974 Oshkosh Fly-In. Condition: Used. Listed at 5.00 USD. Historical Significance: The 1974 convention was a key year in the event's growth after its permanent move to Oshkosh. Location: Wittman Field, Oshkosh, Wisconsin. Front Cover: Features a stunning color photograph of two biplanes flying over a landscape, with the convention text prominently displayed.