You seem to want a degree, because it is a degree.
A degree is always "in" something. There are interesting career options for licenced engineers with a graduate education. But,what do you want to do with it? That starts to define what you want...
- Maintenance management?
- Organisation management?
- Aircraft design?
- Research?
Look into those from the position of your career aspirations. And in the meantime, remember than unless you are basically capable of doing a job, a degree is an expensive and useless luxury.
G