I don’t normally cover mistake fares on this site, because I’m very slow off the mark and by the time I respond they’re all gone (although there was that one time…)
But FYI: there are some crazy Cathay Pacific First Class fares out of Vietnam which (A) won’t last and (B) probably won’t be honored. If you’re the sort who likes to roll the dice though, you’re welcome to join in.
Fares from HAN/DAD to North America (LAX, SFO, YVR, EWR, JFK) are pricing at ridiculously low rates of US$1.2-1.6K round trip per person. You can find the fares on Google Flights and book them through CX’s official website.
I managed to book two tickets in March via CX’s official website. My payment went through and the e-tickets were issued. I realise it means absolutely nothing if the airline decides not to honor the fares, but hey, nothing ventured…
My fare came up to US$1.2K per person, although I understand some people were able to book US$845 fares earlier on.
These fares have a US$300 refund fee and a US$100 change fee, but if the airline unilaterally cancels the fare then you won’t have to pay anything. So there’s very little risk to you if you want to join in, but I should emphasize again that it’s more likely than not that the fare will not be honored.
Advice for booking mistake fares
Let’s be clear about one thing: this is obviously a mistake fare. The airline can choose to honor it out of goodwill. Then again, they can choose not to. I wouldn’t make any non-refundable plans (e.g positioning flights to Vietnam, hotel bookings) until the dust has settled.
Based on past experience, the airline will pull the fares and issue an announcement on their decision whether to honor or cancel the tickets within 24 hours (I can’t see this lasting longer than that). You really have no grounds for insisting that they honor the fare, but it is a reasonable expectation that they’ll let you know fairly soon whether they will. Where mistake fares are concerned, it’s best to take a que sera sera attitude.
You can follow all the developments on this Flyertalk thread.