The ATP is required to work for a Part 121 and 135 operations. ATPs are only issued with the following ratings: Airplane Single Engine. Airplane Multi Engine.
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§ 121.481 Flight time limitations: One or two pilot crews.(a) A certificate holder conducting flag operations may schedule a pilot to fly in an airplane that has a crew of one or two pilots for eight hours or less during any 24 consecutive hours without a rest period during these eight hours.