Bidding refers to the procedures that crewmembers are awarded monthly and vacation schedules.

• A. Crew rest periods.
• B. Meal service planning.
• C. Crew assignments during peak times.
• D. The procedures that crewmembers are awarded monthly & vacation schedules.

Answer: (D)

Bidding is the process by which airlines allocate schedules and vacation blocks to crewmembers. It’s a structured system where crew submit their preferences for monthly trips, days off, and vacation periods, and the company assigns rosters based on rules like seniority, qualifications, and seniority-based priorities. This concept is specifically about how monthly schedules and vacation time are awarded, not about regulatory rest requirements, in-flight meal planning, or general assignment of crew to peak-time flights. The statement describes exactly what bidding encompasses, making it the best fit.