Choose from options: Determine if the sentence is true based on the text below:
airlines are always overbooked

How to fly for free<br>Agree to be bumped. Major airlines tend to overbook their flights to compensate for passengers who may not show up. If more passengers show up than can fit on the airplane, the airline will ask for volunteers to take a different flight.
Available choices: a). Yes; b). It's impossible to say; c). No;