The next phase of aerobic respiration is the Citric Acid Cycle, also known as the Kreb's Cycle, named for the biochemist who discovered it. To prepare for this stage, the pyruvate molecules from glycolysis are converted to a 2-carbon compound called Acetyl CoA.
Commercial pilots working in nonscheduled air transportation earned $78,010 on average in 2011, the bureau says. Those employed by technical schools and trade schools averaged $66,070, and workers providing support activities for air transportation earned $71,440.
Commercial pilots can be paid to fly an aircraft. To obtain a commercial pilot license, one must be at least 18 years old and have a minimum of 250 hours of total flight time (190 hours under the accelerated curriculum defined in Part 141 of the Federal Aviation Regulations).