Abstract: Methods and systems for upgrading passengers from commercial airline flights to private aircraft flights are disclosed. The problem of having a return flight of a private aircraft without revenue generating passengers is solved by selecting a commercial airline flight which best overlaps the return flight of the private aircraft, and offering commercial airline passengers booked on the selected commercial airline flight an opportunity to upgrade to the private aircraft flight. Commercial airline passengers willing to upgrade pay an incremental fee which may be used to offset the cost of the return flight of the private aircraft. Commercial airline passengers may be selected based on their participation in commercial airline marketing programs such as those based on total accumulated miles flown.