The Department for Transport has received some 130 letters about the carriage of oxygen. European Regulation 1107/2006 on the rights of disabled persons and persons with reduced mobility when travelling by air does not impose specific obligations on airlines to carry or provide oxygen in the cabin. Where air carriers do supply medical oxygen to passengers on request, it is possible to make a charge for this service. However, many airlines including British Airways, Virgin Atlantic, EasyJet and Flybe allow passengers to use their own oxygen and their own Portable Oxygen Concentrator free of charge. It is important that passengers know airlines' charging policies before choosing which carrier to fly with.