> The current average flight time from NYC to SF is 6.7 hours.
What's your source for this? I take this flight a lot and I find it hard to believe it's more than 5.5-5.75 on average. Looking at the last few weeks for one of them[0] supports my experience.
Maybe your number has TSA/airport time included.
It's probably scheduled times. I find that time in the air ends up being about an hour less than the time on the ticket.