Simple, buy gift card here, redeem for app on itunes:
http://www.ebay.com/itm/100-iTunes-...2?pt=US_Gift_Certificates&hash=item3cdfea7742
http://www.ebay.com/itm/100-iTunes-...2?pt=US_Gift_Certificates&hash=item3cdfea7742
can this be used across any itunes app? or is it specific to aviation apps only?