Finally, after waiting for the chance, my fiancee and I are getting the time we need to do a RTW!

We are going to either do a DONE3 or DONE4 starting in CMB. I have planned this as the DNOE3, and I am working on the DONE4 still- as to try and fit in Australia.

We need to keep IST in there, and want to see friends in SFO, we would like to visit Montreal (YYZ is closest right?) and would like to see NYC, I think that they are the only must visit places, the other flights are to build mileage.

cmb-hkg-lhr-ist-lhr-cai-lhr-yyz-bos-mia-was-lax-sfo-jfk-hkg-del-hkg-cmb

What do you think? As far as I can tell this is valid, if LHR is only a transit on 2 of the trips. Is there any way to avoid LHR so often, and still get to CAI? The new taxes in LHR seem quite expensive

Hoping to use CX and BA for intercontinental, and then AA in the US. i can use my 500mile stickers to upgrade those fligths to first right?

I'll post the DONE4 soon.

Thanks in advance for all of your help.