What Happened To Delta Air Lines’ Boeing 737-700s?

Delta Air Lines today operates one of the world’s largest fleets of commercial aircraft, including models meant to serve pretty much any kind of route and offering impressive performance. The airline has built a business model that most analysts would refer to as a hub-and-spoke system, one that relies heavily on funneling travelers through massive hubs like Hartsfield-Jackson Atlanta International Airport (ATL), John F. Kennedy International (JFK), and Los Angeles International (LAX).