Some, but not all, airlines require a four year degree. They couldn't care less what that degree is in. With how the aviation industry is now, it is a good idea to have a back up career idea, or some other way of making money if the airline you work for lays you off or goes out of buisness and leaves you jobless. Therefore, you are better off getting a BS in Accounting or business or something that you can fall back on, being that the airlines don't care what your degree is in anyways. This could be helpfull to some corporate jobs because they know that you will be able to do things other than fly a plane.
That help?