Originally Posted by NoWindowSeat
This is totally irrellevant issue to argue over, no matter what the rules say, the real life is that a DONEx ticket allows one to travel in business class on all LAN operated flights which do feature atleast 2 classes of service, SCL-IPC vv being one of those.
Star file says
"AY/EI/LA/LP Domestic D class booking in Y"
None of these airlines have J cabin on their domestic flights (= the real reason behind the rule, not trying to keep DONEx pax in the back...) however, SCL-IPC continues to PTT, as have already been mentioned, and must therefore be classified as a part of an international route
Long post short: all DONEx pax, happy J-travel to IPC (D availability permitting

Thanks, it all makes sense now and I'm glad we've cleared this up
Sorry to be a nuisance, but I have some more questions!
* Can I contact the UK/US BA RTW desk by email?
* How does seat selection work? Would MMB on ba.com work for all the flights or just the BA ones, assuming I'm booking through BA?
* Is there any way one can use BA miles to upgrade some of the flights (MFU)?
Thanks again - this forum is an amazing resource and I hope to give as much help as I've received when I become a bit more experienced at this