My friend is asking a very generic question. If he wants to hit, say 20 locations, how much will the plane tix cost. He needs to go back and forth (instead of one direction), so RTW tix may not be applicable. Is there a website that can plan that (other than Orbitz...etc)? I would also like to see if the website can tell us if it's better to book one RTW, with side tickets for those backward flights.... Hope this make sense. Thanks in advanced.