Are you a deal hunting savage? If you are, you know that occasionally extremely low fares come about out of error and only last for a few minutes. This is NOT one of those cases. We're seeing arguable the best intentional fare to Asia from many US gateways and though it's not an error, it's definitely not going to last...
Air China is expanding their US base and they want you to take notice (and take flight). To help with that effort, they're offering $399 round trip fares from many US departure points to Tokyo, Hong Kong and Seoul. Basically, you can fly to the best of Asia for less than a crowded beach in Florida. It's amazing.
The Deal Dates
This deal is widely available from October 16th 2016 thru March 2017. The only catch? You'll need to firm up your plans in the next three days to book by July 24th. It's a weekend flash sale. You literally can't go wrong with this deal. It's incredible.
Air China occasionally runs upgrade auctions where you can put in a bid and even after, aggressive up sells to business class at the gate. That makes a pretty fantastic opportunity to try to turn an incredibly low fare into a spectacular bargain. Best of luck!