What is the man doing with the Union Airlines What is the man doing with the Union Airlines A．He is booking an e-ticket to London. B．He is consulting about his passport. C．He is paying his insurance of the flight. D．He is checking in his flight.
A．He is booking an e-ticket to London. B．He is consulting about his passport. C．He is paying his insurance of the flight. D．He is checking in his flight.