For most flights to and from a European Union airport, passengers with disabilities and reduced mobility can request free assistance to help complete a journey. This can cover travelling through airports, getting on and off planes, transferring between flights at an airport and help during the flight itself. Assistance needs to be booked 48 hours in advance and you can book where you bought your ticket, for example the airline or travel agent. Airlines can only refuse a booking, or ask a passenger to travel accompanied, on aircraft safety grounds.
Airlines must carry two pieces of mobility equipment, such as a wheelchair, free of charge, so long as the equipment fits through the aircraft doors.
Similar legislation applies in other countries including the United States. However, there are many parts of the world where assistance may require a fee or may not be available at all.
For further information about air travel please visit the Civil Aviation Authority (CAA) website.