. . "Bell X-1 Glamorous Glennis" . "X-1 supersonic aircraft" . "7" . . "Bell X-1#X-1B" . "first supersonic flight" . . . . . "X-lB" . . . . . . . "X-1A X-1B X-1C X-1D" . . . . . . . . . . . . . . . "X-1A" . . . . . . . . . "Bell X1" . . . . . . "X-1" . "Bell X-1#X-1E" . . "Supersonic aircraft" . . "Bell X-1#X-1D" . . . . "X1" . . . . . . "X-1A, X-1B" . . . "Bell X-1" . . . . "XS-1" . . . . "X-1A and X-1B" . . . . "Bell X-1" . "Bell X-1E" . "Bell X-1A Glamorous Glennis" . "Bell X-1" . . . . . "Bell X-1#X-1A" . "Bell X-1A" . . . . . . . . . "S-1" . . "the aircraft of the same name" . "Replica Bell X-1" . "supersonic flight" . . . "X-1E" . . . . "Bell XS-1" . . "Bell X-1B" . "Bell X-1#X-1C" .