I know a few people who work as hosties and they don't have degrees - if you're selected you go through a training process for a number of weeks...depends on the airline. Contact them directly and ask. All the best!
The job of "cabin crew" or "air steward" was dicussed a lot recently papu. have a scroll through the answers - about 2 weeks ago I think. Maybe some info there will help you. Good luck! :-)
You can get a qualification in air hostessing. At park lane college leeds they have a special course in it. They have all the specialist equipment too. However, i dont think it is a degree just a high qualification.