A
degree? In my day you could get on the joint BOAC/BEA course at Hamble with a couple of "A" levels (Maths and Physics)
. To be serious, it must depend on
where in aviation you want to work. I should imagine that degrees in Law, Economics, IT, Human Resources Management, Mathematics etc. etc. could all be useful in the right context. For work as flight deck crew I don't know which degree subjects are preferred.