Great thread, it's exactly what I need right now. I'm about to book a DONE5 RTW ticket. It'll start with Qantas but the majority of the flights are on LAN (5) and AA (5), with 1 or 2 each of CX, Iberia, and Finnair thrown into the mix. I currently am a JAL member but have barely used it. That said, I can share miles between my family members because I have the JAL credit card, which would presumably come in handy. However I'm wondering if I should use a different mileage club for this ticket, considering none of it's on JAL.

(1) What is your home airport? (SFO, SCL, London LHR, HKG, Singapore SIN etc.)
Reply: Tokyo
(2) How many miles do you usually fly each year & in what class? (<25K, 25k-50k, >50k)
Reply: ~40k, mostly in Economy, roughly a third of this on credit card miles
(3) What types of fares do you usually buy ? ( First, Business, Economy etc.)
Reply: Economy (this RTW ticket is the big exception)
(4) Can you choose your airlines and/or, class of service?. Do you travel for work and/or pleasure?
Reply: Mostly pleasure in which case I can choose, sometimes work in which case I normally can't.
(5) Which routes do you fly most often (US Domestic, Transpacific, Kangaroo, in Asia etc)
Reply: Tokyo to the rest of the world, in particular Vancouver
(6) Do you have FFP status of any kind of OW or other airline at present? What is it? (AA Executive Platinum, QF Gold, UA 1K, LAN Comodoro, etc)
Reply: no, although I hope to get some kind of status out of this RTW
(7) What is most important to you in a FFP? (upgrades on travel, priority services when flying the airline, extra baggage allowance, good award redemption rates, better award access, free - discounted lounge access, etc.)
Reply: Bonus on earning rates
(8) Preferred Airlines
Reply: No particular preference - most of the Asian airlines are pretty good.