Originally Posted by DiamondZ

Not much additional cost to excess into a common rated, lower paying seat. There's potential to have smaller more frequent bids to level out required flying before and after peak. The 757 will obviously be the most junior plane on property. In general, most pilots would probably upgrade to the 767 without having to go through training on another platform, making the 767 the 'junior' WB plane. Would be very easy to excess the bottom back and forth as necessary.