sentences:  During refuelings, Eaker and Halverson manned the controls, Spaatz and Quesada supervised the fuel exchange, and Hooe operated a "wobble" pump.The C-1 approached the "Question Mark" from above and behind, maintaining 20 to of vertical separation, until in a position slightly ahead of the C-2.Both aircraft stabilized in level flight at and the hose was reeled out.