Originally Posted by
silonic
......they often get you to scan it when there are still people in front of you waiting to use the trays and countless others queuing to go through the body scanner/detector - thus fudging the wait times.
But that is still a valid measurement though because it is between two fixed points in the security queing system and the same for every pax. There may be a small variance if one pax scans when there is no-one in between themselves and the scanner trays and a few minutes later, another pax scans when there are 3 people ahead.
But overall these things will tend to average out and it is still a valid measurement because it is no doubt intended to be used as an
indication of current queing time - as opposed to an absolute and precise measurement.