He's attempting to argue the efficiency, for a commuter I suppose, is worse on the 756. In some respects he's right because there are far more 2 and 3 day trips on the 757. The junior lines on the 737 do in fact create a more commutable schedule with far more 4 day trips being available. And since a 73 pays the same as the 752, you're not making any more money with that transcon out of lax or sfo. It is possible to get 5 day domestics which the 73 doesn't have, but there aren't enough of those for a commuter to think he can bid just 5 days and be set.