Looking at the graphic, it doesn't seem (to me) like a very comfortable ride.

A fully-loaded 737-900 has an absolute maximum acceleration of about 0.27g (it's actually less - I'm ignoring drag and rolling resistance of tires on runway). Applying (for "human comfort") that performance to the Denver - Ft. Collins route and presuming it actually reached a cruising speed of 700mph, you'd spend 2 minutes accelerating to 700mph at 0.27g, 5 minutes at 700mph, then 2 minutes decelerating to a stop at 0.27g.

I foresee a spike in barf bag manufacturing futures.