But they can't change the price at that point.

I get, very often, ‘this flight is no longer available at this price’ after filling all pages. That is the same thing but presented in an infuriating manner.

True they can't change the price at that point, but I just tried out for S&G's and apparently all of the major airlines now block Tor. There goes that idea!

Well, there's no reason to use Tor, because you'll need to identify yourself before purchasing a ticket. But you can use a VPN service.