sentences:  Aboard the "Question Mark", either Halverson or Quesada did most of the piloting during cruising flight while Eaker monitored the throttles for smoothest engine performance.A log was kept by the flight officer (co-pilot) and dropped to the ground daily, and Eaker was responsible for winding the barograph, an instrument that continuously recorded altitude and time as documentary evidence for the records.Less than an hour later Moon completed the first refueling over Van Nuys.