Well adding on to what I said, university degrees will only get you further up in the airline if anything. Not at all necessary and puts you at no advantage to other candidates. Also your education at A Level is just as important if not more than any other aspects of your life. Bear in mind airlines look for a balanced person so make sure you can priorities your time correctly to maintain a sufficient balance between working and having fun. All in all, university gets you no where in this field and A levels do.