How do Part 135 and Part 91 flight times interrelate?

In the context of flight operations, particularly under the regulations set forth by the Federal Aviation Administration (FAA), Part 135 and Part 91 encompass different operational standards. Part 135 governs commercial operations—specifically those involving on-demand air services like charter flights. Part 91, on the other hand, pertains to general aviation operations, which includes private flying and non-commercial activities.

When a pilot accumulates flight time under Part 91, it indeed counts toward meeting the experience requirements for Part 135 operations. This is because the skills and knowledge gained during Part 91 operations are applicable and relevant in the commercial aviation context outlined in Part 135. Therefore, a pilot's total flight time, including time logged under Part 91, can be utilized to fulfill the qualifications necessary for operating under Part 135.

In contrast, the reverse is not necessarily true. Time accumulated while operating under Part 135 is not automatically applicable to Part 91 operations. Part 135 operations have specific training and operational guidelines that may not align with the more relaxed standards of Part 91. This distinction highlights how the regulations are structured, emphasizing that while experience is cumulative, the categories operate differently in terms of requirements and applicability.

Hence, the relationship established in your response