Hey everyone. I am looking to book a tour package to Vietnam or Thailand. As part of the package they will book a flight from LAX to Ho Chi Minh City via China Airlines.

After doing a bit of searching, it appears that China Airlines is now a part of SkyTeam. So, my question is: is it possible to use Delta miles to upgrade my Economy China Airlines ticket to Business/First class? And, does it matter that the flight will be booked by a 3rd party?

Thanks in advance for your help,
Jason