I don't know. If they don't, or if it's unaffordable, then that means that a lot of "private" businesses are actually implicitly backed by public money. Somethi

I don't know. If they don't, or if it's unaffordable, then that means that a lot of "private" businesses are actually implicitly backed by public money. Something to bear in mind the next time these companies complain about government interference, or libertarian types complain about paying taxes. Most likely, the price of flights would be an order of magnitude greater if airlines weren't (through various direct and indirect means) publicly subsidised.