Flight attendants fly for free through a system known as "Non-Revenue" (non-rev) or standby travel. When a flight has empty seats after all paying passengers have boarded, airline employees can claim those seats for free or for a nominal fee (usually just the airport taxes for international flights). This benefit is based on seniority; flight attendants who have been with the company longer get first priority for the available seats. If the cabin is completely full, flight attendants have a unique "backup" option: they can often sit in the jumpseat (the folding seats used by crew during takeoff and landing), provided they have the captain's permission and meet safety requirements. Most airlines also provide "buddy passes" or discounted tickets for friends and family, though these also function on a standby basis. While it sounds glamorous, it requires a lot of flexibility, as employees often have to wait through multiple full flights or travel at odd hours to find an open seat to their destination.