We are both in the realms of the hypothetical anyway so I will argue my point. The relationship between club and sponsor is big, the planes used as City fan taxis and the reasonable prices/promotions they would have to use to get City fans on board could easily be offset by the Company as a whole. Also those planes wouldnt have to sit dorment in a hanger between matches they could serve a purpose for Etihad in Europe.
Just Imagine you call City up for your European away match for a ticket, it costs you X, City then offer you a discounted flight and hotel package for Y using Etihad. Would save a lot of ball ache if they could figure something out. As for those stranded fans wouldnt it be great to see the OFFICAL CITY plane come to the rescue.