I should remind you that in North America, each and every minute of every day, some 5,000 or 6,000 trips are taking place in the air transport network as a whole. In each case, passengers must either board a connecting flight because the initial aircraft is going somewhere else, or board a flight from another airline altogether. So to try and determine the profit made on one section of a route is practically impossible. There are only estimates.
As for your second question, please forgive me, I've just forgotten it.