Degree in Law. Helped me in aviation because without the law degree, i wouldnt have been able to work in a law firm. This job allowed me to save enough to complete all training in 2 years and come out debt free.
I have no doubt it helped when i eventually applied to QF, not because of the actual degree, but because it takes people from all walks of life and backgrounds to work in an airline.
As i have not stayed current with many law changes/updates, it doesnt really help now. The best part is though, with a legal background, you learn how to interpret legal documents. This is good because it provides many hours of laughter when listening to other peoples completely incorrect interpretations/applications/opinions when flying across the pond...