Thank you all for your great responses. Since we can transfer miles from Marriott to both CO & US and fly F it looks like we will use US for domestic and CO for Intl. Will check out CO for our Hawaii trips. I love doing the research for reward miles and will keep looking since the next flight will be 2012 - then our AA miles are all out. We already have 2011 booked with AA. So I do have time to make a decision, looks like we have flexability in our airline choices. We are just spoiled with AA flying all over the world, never had a problem getting intl F with BA.
Thanks,
SD