Demand and booking patterns are different. The business/leisure customer mix is different. The corporate workplace is different. 

The post-pandemic landscape for commercial airlines is different. Demand and booking patterns are different. The business/leisure customer mix is different. The corporate workplace is different. 
 
At the same time, the average aircraft size flown in key world regions is increasing, a reflection of the strong order backlog for new large narrowbodies. But larger aircraft are not always economically or operationally optimal for medium and lower-density markets, particularly when multiple daily frequencies are essential for those cities to stay well-connected.