Singapore Airlines is in discussions with Airbus and Boeing to revive its 19-hour flight from Singapore to New York, according to Bloomberg. 

When it was offered, this 9,000 nautical mile direct flight between Newark Liberty International Airport and Changi Airport was the longest commercial flight in the world. The carrier discontinued its nonstop service between Singapore and New York back in 2013 because it was not profitable. After this change, the trip became five hours longer for passengers. Currently, a stopover in Frankfurt is required for passengers flying between the two cities.