At what age does a passenger qualify as an 'Adult' (ADT) according to aviation regulations?

A passenger qualifies as an 'Adult' (ADT) according to aviation regulations when they reach the age of 12 years. This classification is important for airlines as it defines pricing, seating arrangements, and other operational considerations.

In the context of air travel, the distinction between different age categories—such as infant, child, and adult—ensures appropriate fare structures and seat allocations. Since the regulation states the adult category starts at 12 years, passengers aged below this are generally categorized as children or young travelers, often subject to different fare policies and travel requirements.

Understanding this classification is crucial not just for ticketing, but also for compliance with safety regulations that may vary based on a passenger's age.