Author: Sharad Ranabhat

Alaska Airlines (AS) has cultivated a dominant presence on leisure-heavy international routes from the West Coast, with Mexican resort cities playing a central role.

In this article, we explore Spirit’s 20 busiest international routes based on the number of flights, available seats, and available seat miles (ASMs).

Let’s explore the top 20 busiest international routes flown by JetBlue, ranked by frequency, and grouped by their underlying strategic themes.

American Airlines (AA) is one of the largest and most dominant airlines in the world, and its domestic network of routes forms the backbone of its operations.

United Airlines (UA) boasts a vast domestic network that connects major cities across the country.

It’s no surprise that Atlanta Hartsfield-Jackson International Airport (ATL), Delta’s mega hub, dominates the busiest domestic routes.

Southwest Airlines (WN) has never been like its U.S. peers – not just for its low fares and open seating, but for the scale and reach of its domestic network.

Delta Air Lines (DL) international network is a blend of leisure-oriented routes, major alliance hubs, and high-yield transatlantic services.

Three of American’s top 20 busiest international routes connect to Cancun from Dallas (DFW), Miami (MIA), and Charlotte (CLT).

The March 2025 data reveals five international routes from MCO in the top 20, serving Montego Bay, Aruba, Nassau, San Jose, Punta Cana, and Grand Cayman.