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Commercial aviation is the part of civil aviation, whether general aviation, non-scheduled service, or scheduled airline service, that involves operating aircraft for hire to transport passengers or cargo.
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Cruising at the speed of sound
Is it possible or feasible for an aircraft to continuously cruise at the speed of sound? Is the drag at this point higher or lower than in the high Mach 0.98 or Mach 1-1.2 region?