The ATP is required to work for a Part 121 and 135 operations.
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For example, Part 135 requires strict pilot duty time limitations, drug, and alcohol testing, pilot background checks, and a wide variety of safety requirements for operating and maintaining the aircraft.
Visibility requirements regarding weather conditions also apply under Part 135. The Visual Flight Rules for visibility for aircraft says “No person may operate an airplane under VFR in uncontrolled airspace when the ceiling is less than 1,000 feet unless flight visibility is at least 2 miles.”
A single-pilot operator is a certificate holder that is limited to using only one pilot for all part 135 operations. That specific pilot is listed by name and certificate number on the FAA issued Operations Specification (OpSpec) A040.
§ 135.265 Flight time limitations and rest requirements: Scheduled operations. (1) 1,200 hours in any calendar year. (2) 120 hours in any calendar month. (3) 34 hours in any 7 consecutive days.