An Empty Leg, also known as an empty jet or empty sector happens when a private aircraft flies empty due to planned repositioning like returning to base, or when a client has only only booked for a one way flight. These flights are often available at a discounted rate when compared to the usual charter price.

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Empty leg flights will have a predetermined aircraft type, departure date and time, and destination. The details of an empty leg flight generally will not be released until a few days before it is due to depart.