The two older men on the Phuket plane have been confirmed as Mel & Mike, but has the "asian looking man with his girlfriend" been confirmed as Victor & Tammy?
I'm starting to think this "asian looking man with his girlfriend" is actually Kris & Amanda. First, Victor looks clearly Asian... you'd describe him as an Asian man, not an Asian-looking man. The person who saw them on the plane also said he/she spoke to this Asian-looking man, but still said his partner was his girlfriend rather than his sister and didn't call her an asian-looking girlfriend.
Kris has dark hair and a baby face and looks like a "nice guy". He could easily be mistaken for being "Asian-looking" by someone who's had a little too much free booze on the plane!
Also, in an article on Sandiego.com, it says that Amanda & Kris traveled 40,000 miles during the competition.