B Sousa:
Yes, that's exactly my point: the airplanes are always full between the major hubs! But if for that you had to go buy the passenger by "offering" him his connecting flight, then asking where you lose the money, on the full or the half-full airplane, is a moot point, is it not?
Networking is a complicated thing, and I don't understand half of it, but there's some stuff that just have to set off the alarm bells...