City University, in London, offers a variety of MBA and MSc courses some of which I believe are aimed specifically at aircraft operations and maintenance.
http://www.city.ac.uk/
You need to consider what you will get out of this though, and whether your current experience and qualifications are appropriate for the course. It's an expensive stay in London otherwise. It is most certainly not a passport into a good job and big salary. You should think of it as an asset which puts extra tools in the roll cab of your career. Ultimately it is you, your achievements and abilities that an employer will be looking for, not just some letters after your name.