<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by number_6:
Intermediate transfer points are not counted, so in your example it is SAN-NRT-SAN as long as there is not a stopover at xxx. All mileage is calculated as round-trip, even if you don't actually travel back to the point of origin.</font>
Not quite totally correct. This is only the case if it is the same flight number that transits through XXX. If the two sectors are two different flight numbers, then the milage is the sum of the sector distances (and return as mentioned earlier).