Don't forget that you'll still have 5 N. America flights (including one transcon) and two stopovers available when you get back. You won't be able to leave the US/Canada again, though.

Thanks. I did not know that! When does this expire? In what class can I book?

Do I need to do anything to keep these available or is the expiration date the only important thing?

Thanks again!!

SYD-HKG-FCO on CX can be upgraded using Asiamiles (space available, and some FCO service does have an F cabin); SFO-SYD booked on QF can be upgraded using QFF miles, but AA codeshare cannot be upgraded using either AAdvantage or QFF.

It books into A (domestic first class) or D (carribean, canada and latin america), and is valid for 1 year from date of issue, however you should book them before ticket is issued to save the change fee (or pay USD 125 fee to add them later). You are limited to 2 stopovers, and 1 of those is used after you return to SEA. You could go as far south as Panama, as far north as ANC, and AA flies almost everywhere in the Carribean. You could even fly BA on a few of their 5th freedom inter-island flights in the Carribean. Sample route might be SEA-JFK-SJU-ORD-SEA.

Thanks. I doubt that I will be able to book before the ticket is issued (March 29) but still worth $125.

BTW, I read something about changes April 1. Is that why I need to purchase the ticket by March 29? Or is that the standard hold time?

That would be an assigned hold time; unlikely to have anything to do with Apr 1.

I think both of my CX flights (A333 and Boeing 744) have first class. Requires 95,000 Asia miles (distance is just over 10,000 miles according to Great Circle mapper).

Unfortunately, I do not have Asiamiles, but loads of AA miles. Can my AA miles be converted to Asiamiles at a reasonable rate? Did a search and could not find the answer.

Thanks.

Unfortunately not.

Except watch out for this:

42N . 6. 1 INTERNATIONAL DEPARTURE AND 1 INTERNATIONAL
43N . ARRIVAL FROM/TO THE COUNTRY OF ORIGIN PERMITTED.
44N . EXCEPTION: ORIGINATING USA - 2 PERMITTED WHEN 1
45N . ARRIVAL-DEPARTURE IS A TRANSIT WITHOUT STOPOVER.
46N . NOTE: TRAVEL BETWEEN US AND CANADA IS NOT COUNTED
47N . AS INTERNATIONAL.

Forgot about the US being country of origin (I never buy US/Canada origin OWE tickets, in part because of this rule!).

Gardyloo is quite right, once returning to the US the additional 5 segments are limited to being in the US/Canada and do not allow travel to Mexico, etc. SJU is still part of the US, though.

The circumvention for the OP is to return FCO-LHR-YVR, which would allow the remaining 5 segments to be used anywhere in North America (as described in my original post; having not returned to the country of origin, the quoted rule doesn't apply). YVR is probably more convenient than routing through SEA, in any case! Certainly a nicer flight, and BA has always had one of their better services to YVR (nicer than to LAX, oddly enough).

I can't see that. Once you touch the US on the way back that's it, from then on the only places you can go to are within the US and Canada.

Could I do LAX-HNL-LAX? Would have to book an AS flight SEA-LAX-SEA. Nice get-away from the Seattle rain, as you know.

Also will be doing an SEA-DFW-SEA in November.

Nope. There's a special rule that forbids return trips to HNL.

OP should be aware that though the LHR-YVR flight is arguably nicer, its still a BA TATL and therefore does not earn AA miles.

Which brings me to another question: can different segments of a xONEx ticket credit miles to different OW partners? i.e., can the LHR-YVR TATL segment credit to AsiaMiles or BA Exec Club even if the rest of the ticket credit AAdvantage?

Yes.