I *think* I understand it, although there are several permutations/scenarios that come to mind. Given a *held* (unpurchased reservation), one can go on line & cancel it; or change flights although presumably this might result in an up or down change to the fare itself, but with no $150 change fee involved; or just let it languish & eventually expire, but at the same time setting up a similar, but different itinerary. OR, you've booked & purchased an itinerary, but according to another thread I saw today, this could be canceled within 24 hours w/ no penalty, e.g., full refund (seems too good to be true); BUT, if you make a change to that purchased itinerary, the $150 applies? [my head is beginning to hurt]