What is Birminghams USP
Interesting question, you could ask that of virtually any UK airport. As far as BHX is concerned I'd say the ICC and NEC (world class conference and exhibition centres) plus (to the english speaking world) - Shakespeare's Stratford.
I think that my first two go some way to explaining why scheduled business services and interline connections are so important to BHX - more so than the bucket and spade market.