Why Nearly Every US Flight Seems to Pass Through the Same Handful of Airports

A hub-and-spoke routing model shapes much of U.S. airline network planning, funneling connections through a limited set of major airports and making many itineraries converge on the same handful of hubs. Because connecting flights depend on legacy carriers’ concentration at these hubs, practical constraints like gate availability and takeoff-and-landing slot limits reinforce the pattern. The article points to specific examples: Delta at Hartsfield-Jackson Atlanta International Airport, American Airlines at Dallas/Fort Worth and Charlotte Douglas, and United at Chicago O’Hare, Denver, and Houston George Bush Intercontinental. For travelers, recognizing these network structures can help predict likely layover points and compare connection times across airlines.