Thanks PandaPerth, that was very helpful. I've modified the itinerary so that I fly SIN-HKG first (and get to fly CX as a bonus!). The brackets were meant to indicate non-direct flights e.g. intended destination from SIN is CDG, but the flight stops in LHR.

Two further questions:

1) The online tool appears to book with the first carrier chosen (in this case, CX). How does one go about booking with AA - call them directly? Does CX charge service fees like QF?

2) It will cost SGD 16725 for D class and SGD 7315 for L. I have NEVER flown D before - given that if I buy a D fare I can experience D class in CX and QF (I doubt IB and LA will be as good) is the price difference worth it?

To answer your queries,

1) Yes I am starting in SIN so I can get a few extra trips out of the ticket. I have to come back to work (you're right - in East Coast Oz) after the SCL-BNE leg, and was thinking of using the remaining segments next year. So while it might be cheaper to fly from AKL I won't get maximum use from the ticket.

2) I spent 2 months in Peru in 2006 (work and play) have already done the Inca Trail, Machu Picchu, Lake Titicaca and the Sacred Valley. Going to explore the rest of the country this time round, so no regrets flying from LIM to LPB. Might have to take some internal LAN flights though...