BTS is only some 40miles from Vienna, how far is STN, LTN from the City of London? Pax know how far the airport is from the city, when you book your hotel ect, can't be doing too bad with 50m pax this year.
Anyway if you look on one of my BTS flights from EMA it's about 70% of who are from the BTS and the rest just on a cheap piss up, and not many of them are that interested in the culture of Vienna other than just a cheap day trip up the river. (Good spenders though, all good for my commision
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Lee