A plane ticket is a document that allows someone to travel on an airplane. It indicates the date, time and destination of the flight as well as information about the passenger such as their name, contact details and any special requests or requirements they may have. The price of the ticket also depends on various factors like the distance covered, class of service chosen, and the availability of seats at the time of booking. In short, a plane ticket is an essential document that enables someone to travel by air from one place to another.