I'm planning on doing a rtw in the near future with One World in first class and was just wondering what the availability is like generally in terms of the cabin i fly and the seat selection. I know this all depends on each airline and how popular certain routes are. However, what i'm trying to say is, if i book my rtw in first, do the airlines treat me as if i'm the same as someone using award seats or will they treat me as if i'm any other paying customer. Also, on a side note, i was planning on taking the LAN flight from FRA-MAD. Will i be allowed to book first class seats if i'm only on for this leg of the flight and not continuing down to SCL.