Surface segments need to be included in the mileage calculation. No backtracking between continents is a one world RTW rule (and lots of other RTW products). For *RWSTAR* there is only one trans-atlantic, one trans-pacific and one europe/africa to asia/australia-south pacific crossing - but within this can do up down back sideways whatever. Of course if you do to many longhauls quickly run into overall mileage limit.