OAG data shows that something interesting happened over the last decade. Boeing began dominant, with the 737 outpacing Airbus A320 aircraft in scheduled flights and time in the air – and several Boeing planes cracking the top 10.
At the end of the decade the A320 family was ahead of the 737, and both the Boeing 757 and MD80 had dropped out of the race for dominance in scheduled flights. The Boeing 777 became more popular, and 787s spend more time in the air than Airbus A350s. However the 767 is slowly fading from the scene.