The best (and only) flying simulation I've ever experienced was on a ride at California Adventure, which was built inside a warehouse. Riders were locked into a seat (rows of about 6) and a projector turns on. Wind starts blowing, as the scenery changes below you. My favourite part of it though was when they tilted the seats back and forth, simulating g-force. Would love to see one of these happen for Oculus Rift, although it's not really a consumer product.