It’s an interesting and compelling idea to think about an airline flight that is free. Of course, many would argue that the flight isn’t free, because they’re charging for all the extras. The key question is, how many extras do you need? If you are someone who likes all the extras, then you’re subsidizing the flight cost for someone like me who doesn’t mind going without some of the things like airline food.
Of course, the advertising and hotel and rental car affiliates can make the price reasonable for the passenger who wants all the extras and free for the few of us that don’t really need much. Sounds like a great idea to me. Now if we only lived in London.
If you like free, then you should also read this article on the economy of free.