Originally Posted by
Thunderroad
+1
In addition, I just don't think that many folks will use this for lie-flat sleeping, except for red-eyes, at least compared to international flights.
Redeye flights are a major factor for west to east transcons. You can't get to the east coast from LAX or SFO in the morning without taking a redeye given the time change and the flight length. If you don't want to go the day before and have another night in a hotel, being able to sleep on the flight is a very important factor.