After news broke, attention turned to whether Cathay will honour the tickets, which typically sell for HK$35,000 ($6655) in business or HK$55,000 ($10,500) in first class for a return flight. "You can fly from Southeast Asia (Vietnam) to NY in Cathay Pacific business class from $675 roundtrip".
"To those who bought our good - VERY good surprise "special" on New Year's Day, yes - we made a mistake but we look forward to welcoming you on board with your ticket issued", the airline wrote in a tweet.
The tickets are for flights from Vietnam to NY on Cathay Pacific for around US$675 (RM2,798) return instead of about US$16,000 normally.
While Cathay didn't immediately say whether it would honor the bookings, the mistake adds to the embarrassments for the Hong Kong carrier that's struggling to turn its fortunes around while competition intensifies from Chinese and budget airlines.
The Hong Kong-based airline sold the first and business class tickets from Vietnam to either Canada or the U.S. on 31 December for economy prices.
However, the South China Morning Post reported Wednesday that a New York-based professional who bought two first-class tickets between Da Nang and the USA city had his booking cancelled without receiving an explanation from the airline.
The offer for the cheap business class tickets lit up the internet in the new year with frequent fliers and bargain hunters alike buying tickets quickly as word spread across social media and popular flight blogging websites and forums. A return trip from Hanoi to Vancouver on first-class will cost $988, according to travel blog One Mile at a Time.
Twitter users who said they had bought the cheap tickets lined up to welcome the news, though at least one questioned whether it was a publicity stunt - something an airline representative denied.
The airline's mistake comes a few months after the company flagged a data breach affecting up to 9.4 million passengers. In 2014, Singapore Airlines made the same mistake and honored those fares as well. Round trip business tickets to Los Angeles were sold from $2 940.