Which of the following is not free to first-class passengers with this airline

A．He must pay for his own hotel expenses.
B．He must pay the airline a little money.
C．He must have only one stopover.
D．He must tell the airline before departure.

A．Children under two are charged 10% of the normal fare under any circumstances.
B．The second child under two accompanying the same adult is charged 50% of the normal fare.
C．A 12-year-old is charged 50% of the normal fare.
D．Unaccompanied children are charged the normal fare.

A．If the transport is between a town and the airport.
B．If a passenger wants to catch a plane.
C．If a passenger has just finished the air trip.
D．If a passenger is at town terminal.