real reasons
.........now the real reason for all the "U" trun shaped contrails or bent ones was the fact that the earth rotates (obviously) and what appears to be bent is in actual fact a straight line, depends on what part of the axis yr standing on). When you do actually see a straight line then that can be explained by the fact that the atmospehere (on those days) has a lot of prismatic effect culminating in an ocular distorted visual deception of almanac proportions, all meaning that if you are thinking otherwise thus far reading this then best you pack up yr 'trainset' & go play with yr Lego blocks:-) *smile* for now yr a real airline pilot, straighten up & fly right !:-)
Did anyone recently notice the upper wind charts (GPWT) ??? (Bus drivers must have) here was a jetstream smack bang across the middle of this great land of ours that showed winds (from the west) of 200kts !...................don't see this too often:-)
Capt Wally :-)