Yes, definitely. It is actually very easy. You can take classes online, off base at a college campus, or on base at the education center. You can take more than one class at a time, but you do have a cap on how much you can spend per year and it is right around $4,000. Keep in mind that working full time does not leave much time for class and once you are done with work you will be pretty tired, so juggling two or three classes can be pretty stressful, but I have seen people do it. The class will be completely paid for, except for the text books. If you fail the class, then the Air Force will make you reimburse them for the cost of the class.
Another great option to utilize while active duty are CLEP/DANTES testing. You can take these tests free of charge while active duty, and if you pass the test for a certain class, then you get college credit for it. If you fail the test, you just have to wait 6 months to retake it.
If you don't finish your degree while you are in the Air Force, you can always finish using your GI Bill when you get out. Good luck!