We pick our special adapted vehicle up on the 4th april, and we can then wheel ds up the ramp and strap his pushchair in, but we need a car seat for travelling on planes. he will be 3 in april and we are using a 'normal' car seat this year but are stuck as what to do from next year.We travel abroad a lot with him and hate the thought that we may not be able to do it soon. He cant sit ina plane seat cos he is quadriplegic and needs lots of support for his limbs. does anyone know of special needs car seats that last for a child over 3yrs and can they be strapped in with a lap belt?