I'm taking a trip in a few months to BKK, originating in CLT. I'm about to lose my mind trying to select how, though. Who has the best biz class experience in *A? Lie flat is a requirement. Looking like I'll have to connect in NY, LA, Chi, or Houston depending on carrier. Alternative is to take US Envoy direct to CDG (only CLT direct A330 with Envoy suites?) then book a second trip on Qatar through Doha. Benefit there is my return in the US doesn't connect before going home and the flight over (to CDG) is overnight.

Are there any *A airlines where I could use US miles to upgrade to first?

Thanks in advance!