I hope I qualify as both an academic insider, and an aircraft industry insider - but I'm also an engineer and pilot, so business management isn't really my forte: I do flying machine stuff.
I think that an MBA is the route if you want to go into top level strategic / financial business management. I think that the MSc ATM is the route if you want to be a specialist middle to senior manager in the aircraft industry managing stuff that demonstrably involves air transport - aeroplanes, management, business development, etc.
G