What is the primary factor for determining airport categories according to NFPA, TC, and ICAO?

The primary factor for determining airport categories according to NFPA (National Fire Protection Association), TC (Transport Canada), and ICAO (International Civil Aviation Organization) is indeed the length of the longest airplanes using the airport. This criterion is important because it directly impacts the necessary fire protection measures and emergency response capabilities at the airport.

Airports are categorized based on the size and type of aircraft they accommodate, which helps in assessing the risks involved in potential incidents. As larger aircraft have specific fire and rescue needs due to their size and the materials involved in their construction, knowing the dimensions and weight of the longest airplanes informs the planning for adequate firefighting equipment, personnel training, and response strategies.

Factors such as the size of the airport terminal, the number of passenger lounges, or the amount of parking space, while they may contribute to the overall operations of an airport, do not directly impact the determination of its fire fighting and rescue requirements as shaped by the dimensions of the aircraft it services. This focus on aircraft length aligns with the standards and regulations aimed at ensuring safety and preparedness at airports.