I'm planning to go back to Siem Ream and travel to Luang Prabang in the fall. Seems that airfare to Luang Prabang is very expensive, till I found out about Bangkok Airways Discovery Airpass, which allows air travel around Thailand, Laos and Cambodia on Bangkok Airways and Lao Airlines using reasonably priced coupons. Question is - does anyone know where to buy this in the US, and if it's pretty easy to check availability / book a flight using the coupon? From the website it looks like they only have limited seats.
I was curious about this as well for an upcoming trip. I read this and thought it might be helpful?
P.S. Search for Bangkok Air Discovery Pass Review on Lonely Planet and Tripadvisor.