An aircraft may need to be moved without passengers from one airport to another at the end of that day 's operations in order to satisfy the next day 's timetable – these are also known as positioning flights . They may also be necessary following a major weather event or other similar disruption which causes multiple cancellations across an airline 's network resulting in many aircraft and crew being ' out of position ' for normal operations ; the 2010 eruptions of Eyjafjallajökull or the mass evacuation of US airspace following the 9/11 attacks being significant examples of this . Some airlines permit fare-paying passengers to travel on positioning flights
2010 eruptions of Eyjafjallajökull
2010 eruptions of Eyjafjallajökull
Ferry flying