Beginning with its Miami hub next August, American Airlines will “re-bank” its hubs. That means dozens of flights will all land within a narrow time period, then take off within a similarly narrow time period. American also will vary its schedule according to demand, rather than operate the same schedule throughout the month.
In the 1980s, American perfected the concept of the hub-and-spoke network. A key element was that flights arrived together and departed together. That close scheduling maximized the number of connections that the airline could offer passengers with each bank of flights.