very kgood and correct informations above. In add YES, everytime you change your rtw-itinerary they will also recalculate the mileage and controle the mileage limits (this can be dangerous if you just are at the limit, as different airlines calculate different miles for same flight segments: I know of differences of more than 100 miles comparing LH- and UA-miles-calculation for the same segments with the same carriers. Example: LH calculates all flights to New York-area-airports with the same miles, UA claclulates the miles to the individual airports).