Which phase occurs prior to customer boarding?

• A. Customer Boarding
• B. Prior to Door Closure
• C. Takeoff and Inflight
• D. Prior to Customer Boarding

Answer: (D)

Understanding the sequence of flight phases helps here: before passengers begin to board, the crew completes essential cabin preparation and safety checks. That preparatory window is explicitly labeled as “Prior to Customer Boarding,” which is why it’s the correct choice. It happens before any boarding starts, while other phases either occur during boarding (or after boarding) or are tied to later steps like door closure or takeoff. So the label that denotes work done before passengers board best matches the question.