zhaobao

- CX miles expire three years after earned. AA miles do not expire as long as there is any activity in the account every 18 months.

- AA gives bonus miles for elite members, CX does not.

- CX members would have better chances of op-up than other Oneworld members of the same elite level on CX flights.

- It is easier to find seats on CX with AA miles than on CX miles, albeit that it costs AA miles more for short haul flights and the reverse for long haul flights.

- CX Ruby has lounge privileges on CX flights wheras Oneworld members of the same status level do not get access. Only Sapphire and above have lounge access. AA Ruby has no lounge access privilege even on AA unlike CX and no matter what your status is on any Oneworld airline, if you fly U.S. domestic and are in economy, you have no lounge access.

- Again, you earn miles on CX flights in AA program if you fly first class, business class, or Y/B/H economy booking classes. If you earn miles on CX, you earn miles all the way down to V in economy. However, you can still earn miles on AA if you book your CX flight using AA codeshare flight number.

- I think one can fasttrack to Gold (Ruby) or Platinum (Sapphire) on AA by doing the Gold or Platinum challenge. However, the challenge must be done on AA flights or Oneworld flights with AA codeshare flight numbers.

- Most Oneworld airlines allow their Ruby members to check in at business class counters. That applies to AA and CX as well. If based in U.S., getting elite status on AA might be more practical, given the likelihood of flying U.S. domestic flights.

- You can upgrade on CX flights using CX miles, and AA flights using AA miles. However you cannot upgrade on CX flights using AA miles and vice versa.

- Once you reach the next status level in CX you automatically start a new "year" at 0. With AA it is always the calendar year and you get the status for how many miles you receive in that year. So that means it takes longer to go from zilch to Gold on CX than on AA.