With p.s. being an example, I'm wondering if it would be profitable for United (or any airline) to offer guaranteed lie flat seats on some domestic flights or routes.

If you adjust the cost of the ticket price by the percentage of additional space that a lie flat seat takes up over a domestic seat, I'm curious as to how many people would be willing to pay the difference to be guaranteed a flat bed seat.

Taking this even farther, would you remain, join, or leave UA if all of its domestic planes had lie flat seats sold for more than a domestic F seat sells for? (I would probably exclude commuter planed from this).