What key feature distinguishes an airport from an aerodome?

The key feature that distinguishes an airport from an aerodome is the presence of adequate facilities for passenger services. Airports are typically equipped to handle a wide range of civil aviation activities, which includes passenger services such as ticketing, baggage handling, customs and immigration facilities, and amenities like lounges and restaurants. These facilities are essential for commercial air transport, which emphasizes efficiency, safety, and comfort for passengers.

In contrast, an aerodome may not have the same level of infrastructure or services aimed at passengers. Aerodromes can be simpler installations primarily used for general aviation or agricultural purposes, and may serve smaller, less commercial aircraft, often lacking the services associated with larger airports.

The other options do not accurately capture the primary distinguishing feature of an airport. Airports cater to civilian needs with comprehensive services, while aerodromes might not meet those same standards or requirements.