1) A terminal passenger is a passenger joining or leaving an aircraft at the reporting airport. A passenger travelling between two reporting airports is counted twice, once at each airport. A passenger who changes from one aircraft to another, carrying the same flight number (change of gauge) is treated as a terminal passenger, as is an interlining passenger.
2) A transit passenger is a passenger who arrives at and departs from a reporting airport on the same aircraft which is transiting the airport. Each transit passenger is counted once only and not both on arrival and on departure.