If you or any of your eligible travelers hold a confirmed reservation, have purchased a revenue ticket or redeemed miles for a flight, you are not allowed to also list as a non-revenue pass traveler on that flight or any other flights with that same origin and destination less than +/- 24 hours from the departure time of the flight a revenue ticket has been booked or purchased. Even if you cancel your confirmed reservation before departure, you are still not able to list as a non rev less than +/- 24 hours from the original departure time, since you held revenue space, and this could be a potential loss of revenue for the company. If you cancel a revenue ticket, all fare rules apply, if applicable (penalties, change fees, etc.)