[danjones]

I recall this being debunked (at least for airline tickets) completely in a stack exchange thread that was posted here a while back. I'll add the links if I can locate them.

Edit to add links:

[1] http://travel.stackexchange.com/questions/2952/flight-ticket...

[2] http://blog.getinvisiblehand.com/2011/04/08/ryanair-manipula...