What is the most common method of passenger transportation at a commercial airport?

The most common method of passenger transportation at a commercial airport is through the jet bridge. Jet bridges provide a direct and secure passageway from the terminal to the aircraft, allowing passengers to board and deplane without having to go outside or navigate other modes of transportation. This method ensures convenience and safety, especially in inclement weather, and is designed to facilitate efficient movement of large numbers of passengers quickly and comfortably.

While walking is an option for shorter distances within the terminal, it does not accommodate passengers who have mobility issues or are traveling with large amounts of luggage. Buses and vehicles are often used for transporting passengers to remote parking areas or other terminals but are not the primary method for boarding or deplaning flights. Trams can assist with transport within larger airports but are less common than jet bridges when it comes to directly connecting passengers to the aircraft.

Thus, the jet bridge stands out as the predominant means of passenger transport directly to and from the aircraft at commercial airports, enhancing the overall travel experience.