In my long carrer on the ER (1 yesr before being booted to the 88) I can tell you that turbulence is gonna happen. The planes can take a huge pounding. Those of you who have flown both can back me up when I say, if your gonna hit some good chop, you would rather be in the 767 and enjoy the soft cushion of a flexible wing. That 757, although my favorite, will chatter your teeth. At least that what I experienced.