An update from me - LAN looked like a good option for me, redemptionwise, so I went ahead and joined up. However, after Qantas were unable to add the frequent flyer number, I called LAN - have to say, no issue getting through to someone who spoke excellent English, and she helpfully informed me that you can only earn LANPASS kms after you have taken your first flight on LAN metal - only then can you accrue on one world partners! Hey ho, back to the drawing board to weigh up Alaksa and AA again! Thanks everyone!