Having worked in the field for 25 years (i.e., graduated at the University of Hard Knox) I would guess that a BSc Music technology involves a bit of musical theory, acoustics, psychoacoustics, analogue and digital electronics, and information technology.
bucket_and_spade
The fitting of an aircraft with in-flight entertainment/intercom/PA systems isn't done by people with a musical background - it's part of the work of the aircraft engineers/builders and isn't a specialist area.
In-flight entertainment (which IMHO is really an euphemism for in-flight boring c**p) hardware is basically just ruggedized consumer electronics and fitting this stuf is simple assembly line work.
PA systems are another matter: Designing such (safety-critical) systems is a specialist job - at least if it's done right, acoustics being the science involved. However, designing a PA system for a passenger aircraft is not very different from designing a PA system for a shopping mall - except for the parameters.
DeeCee
We supplied a lot of samplers to a simulator company to replay the many channels of sound required to simulate all the different conditions.
How long ago was that? I'll admit that an aircraft simulator has a much longer life cycle than present day consumer electronics, but these days, I'd handle similar requirements with not much more than a PC with a sound card.
Quieter engines and noise cancellation is applied acoustics, but to get to work on that stuff you'd be coming from a mechanical engineering background, rather than a musical one.
To the point:
vinceparker, until we'll be seeing airliners with entertainment facilities more commonly associated with cruise ships
, I think it will be very difficult to find a position in aviation that will allow you to apply your art. If I were you, I'd be looking toward theater teching and such. Not very glamorous, but good fun and you get to hang out with interesting people.