UPS@EMA
Those are 3 facts, but are they valid reasons?
Castle Donington is in Leicestershire but listed in the Derby telephone directory - I don't hear the neighbours squawking on about the fact.
London Gatwick is not in London, it is in West Sussex, but its postcode RH6 is the postal district of Horley, in the county of Surrey, but is has a Crawley telephone number.
Manchester Airport had a number of previous more local names, it is mostly in Cheshire if you get really picky, the towns of Altrincham, Wilmslow and Stockport are actually closer than Manchester.
So, you stated facts - but none of them are valid reasons to change from "Nottingham East Midlands Airport" to "East Midlands Airport".