In 2022, Lufthansa was the airline company that carried the most travelers in Europe, amounting to 101.8 million passengers. Turkish Airlines ranked second, with approximately 71.8 million passengers.
United offers the most international destinations and countries flown to of these three airlines, and it's practically tied with American for the most destinations overall. Delta, United and American each operate flights to hundreds of domestic destinations and international flights to dozens of countries.
The flight from Ceylon to Australia on Aug 30, 1943 remains the record holder for longest time airborne (for a commercial passenger flight) at 32 hours, 9 minutes.
At the moment, the world's longest nonstop flight is the route between New York and Singapore. With a calculated distance of 15,349km and almost 19 hours of flying, the route operated by Singapore Airlines is the longest in the world.
The simple answer is yes, pilots do, and are allowed to sleep during flight but there are strict rules controlling this practice. Pilots would only normally sleep on long haul flights, although sleep on short haul flights is permitted to avoid the effects of fatigue.
It reached London from New York City in 2 hours and 56 minutes flying at the speed of 1,350 miles per hour. As far as subsonic flights go, the record is held by a British Airways Boeing 747 which made it from New York City to London in 4 hours and 56 minutes in 2020.
The twice-weekly Air Canada service between London Heathrow and St John's, the capital of Newfoundland and Labrador, is the flight with the shortest route across the Atlantic, stretching just 2,315 miles and taking under five hours.