A great many of those with a degree do not work in the same field as their degree (which includes pilots, many of whom have degrees in something other than flying).

Much is made of getting a degree in something other than aviation, but a four year degree doesn't actually qualify you to do much anyway. It's more of a lightly specialized continuing general education past high school. In the job market, unless you're looking for a very specific discipline, the four year degree is more of a discriminator or marker that gets you in the application process or consideration for a better paying job, but not necessarily one applicable to the discipline of your degree.