Almost all airlines have a hub where they station employees and do maintenance. The US has the world's biggest airline hub and low-cost point-to-point models
Let's look at where legacy and low-cost US airlines tend to place their wings. American Airlines and American Eagle have 10 hubs nationwide
According to OAG, DFW is the fifth-busiest airport in the world in terms of available seats. This is up from 14th pre-COVID.
You'd expect Alaska Airlines to locate its main hub in its namesake state. The carrier's hub is Ted Stevens International Airport (ANC), 5 miles from downtown Anchorage.
Ultra-low-cost airline Allegiant Allegiant's major hub is Las Vegas Harry Reid International Airport (LAS). Frontier, Southwest, and Spirit also specialise on Las Vegas.
No traditional US airlines are present in this capacity. Las Vegas' airport ranked sixth in 2021.