I was just asked to estimate the size of the "problem" for the airlines in the US....here is my estimate. Based on 570m passengers...if 1% do this means = 5.7m people per year....using b2b only makes sense for FF....so that means at least 6 trips per year....assuming a full Y (anyone buy those anymore?) costs $1,200 but buying b2b saves at least 50%....so a person doing this would not pay $7,200 per year but $3,600....then doing the big math this would equate roughly to 6m people paying $3,600 less than they should - my estimate is that for every 1% that do this, the "problem" is valued at $20.5bn. I of course think much more than 1% do this. However the numbers are huge - any arguments with my logic or math?