Air ambulance services in the United Kingdom provide emergency medical functions, patient transport between specialist centres, or medical repatriation. Services are provided by a mixture of organisations, operating either helicopters or fixed-wing aircraft. All emergency air ambulance helicopters in England, Wales, and Northern Ireland are operated by charities, while Scotland has one charity service in addition to its two NHS-funded helicopters. Fixed-wing air ambulances, used for patient transport, may be government or privately operated.