RET = Rapid Exit Taxiway.
ahhh ok thanks. I’m not really interested in that as much as the difference between a 90 degree turn onto the centerline, brining the thrust to 40% while stationary v’s rolling onto the runway at 8-12 kts with engines spooled up at 40% and then pressing TOGA once aligned with the centerline. Obviously if you roll out at taxi speed you are chewing up runway distance but I think what Boeing is saying is that the kinetic energy you have when you press TOGA using that method is similar ( negligible difference) to the energy you would have at the same spot if you had done a 90 degree line up. Where are the physics geeks?