Qatar Airways has launched the world's longest scheduled commercial airline route with the arrival of its flight from Doha to Auckland, New Zealand. The Gulf carrier said flight QR920 touched down in Auckland early yesterday after covering a distance of 9,032 miles. That is the farthest distance between any two cities linked by direct flights. The outbound journey is scheduled to take 16 hours and 20 minutes on the Boeing 777-200LR. The return trip of 17 hours and 30 minutes, which is slower because of headwinds. What's the longest flight that you've been on?