If what they say about Hong Kong now requiring transit visa for Nepali Citizens is true, I think the best airline to use is Thai Airways. They have recently started a New York to Bangkok non-stop route, re. Los Angeles to Bangkok ta pahiley pani thiyo. But I am not sure how it works out at Bangkok, one might have to stay overnight there to catch the next flight to Kathmandu. Does Bangkok airport have facilities (like at Singapore Airport) where you can catch fast Zzzz's within the transit area? I wonder when and if Singapore Airlines is re-starting their service to Kathmandu.