Looking to book December flights to Asia from Vancouver using Avios. I'm trying to get to Phnom Penh but thought it easier to book one leg at a time, Van to Hong Kong or Van to Narita. The BA site keeps routing me via London. Is there a trick to booking a non-stop partner flights from Van on the site? The BA site offers "find availability with British Airways on other dates" but, again, only offers flights via London. Once there, it links me to Cathay. Any suggestions? Thanks in advance.