Yes that Blairline flight was the longest though there were few pax. It was a 777ER so a 777LR can do the trip & fuel is cheaper now. It may not carry enough pax to make a profit unless J & WT+ only because sleep would be important or a stopover is better. No problem for crew because the 777 can have bunks the full length of the roof, increasing crew, or rest. You would need all the numbers to see if its possible, especially worst headwinds!