Ferry flying is the flying of aircraft for the purpose of returning to base, delivery to a customer, moving from one base of operations to another or moving to or from a maintenance facility for maintenance, repair, and operations. A commercial airliner may need to be moved from one airport to another to satisfy the next day's timetable or facilitate routine maintenance; this is commonly known as a positioning flight or repositioning flight, and may carry revenue freight or passengers as local aviation regulations and airline policies allow. 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. Ferry permit A ferry permit is a written authorization issued by a National Airworthiness Authority to move a non-airworthy civil aircraft from its present location to a maintenance facility to be inspected, repaired and returned to an airworthy state. Ferry pilots Louise Sacchi flew single- and multi-engine planes 340 times across both the Atlantic and Pacific oceans, breaking several records in the process. Other notable ferry pilots include: Helen Marcelle Harrison Bristol Lettice Curtis Maureen Dunlop de Popp Mary Ellis, WWII pilot in the United Kingdom Luis Fontés Joan Hughes Amy Johnson Jim Mollison (Amy Johnson's husband) Robert Neale Robert Olds Jarvis Offutt Jadwiga Piłsudska C. W. A. Scott Diana Barnato Walker See also Air Transport Auxiliary Dead mileage, a similar concept in ground transportation Ferry range RAF Ferry Command United Kingdom aircraft test serials Women Airforce Service Pilots References Further reading Aircraft operations Aviation by mission