Under European law, if you are disabled or have difficulty moving around, you can receive assistance when you fly. This free service is available to anyone with mobility problems, for example, because of their disability, age or a temporary injury. To take full advantage of the service * you need to pre-book 48 hours in advance of your flight.
[*it is recommended that if possible you book such services at the time of booking]
You can find out more information via http://www.aviationreg.ie/consumer-protection/persons-with-reduced-mobility.136.html