What is the main difference between airports of the early 1920s and international airports of the 1930s?

AAirports in the early 1920s catered to municipal and regional travel, while airports in the 1930s

served as hubs for travel between countries.

BArports in the early 1920s had larger runways and airport space, while airports of the 1930s had

smaller, more efficient layouts

CAirports in the early 1920s catered to travel between countries, while airports in the 1930s served as

hubs for regional and municipal travel

DArports in the early 1920s were located in West Coast cities, while airports in the 1930s were

located in East Coast cities.