Over the following months, preparations were made for the first flight, which took place on February 9, 1969, with test pilots Jack Waddell and Brien Wygle at the controls and Jess Wallick at the flight engineer's station.
Nos meses seguintes realizáronse preparativos para o primeiro voo, que tivo lugar o 9 de febreiro de 1969, cos pilotos de proba Jack Waddell e Brien Wygle aos mandos e Jess Wallick como enxeñeiro de voo.