Songquan Deng // Shutterstock

- Passengers: 6,149 (3.7% of all passengers)
- Top carriers:
--- #1. Frontier Airlines: 6,149

#7. Orlando International (Orlando, FL)

Andrew Zarivny // Shutterstock

- Passengers: 8,612 (5.2% of all passengers)
- Top carriers:
--- #1. Frontier Airlines: 8,612

#6. Denver International (Denver, CO)

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- Passengers: 16,306 (9.8% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 16,306

#5. St Pete Clearwater International (St. Petersburg, FL)

Brittx // Shutterstock

- Passengers: 16,543 (9.9% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 16,543

#4. Orlando Sanford International (Sanford, FL)

marchello74 // Shutterstock

- Passengers: 27,172 (16.3% of all passengers)
- Top carriers:
--- #1. Air Wisconsin Airlines Corp: 11,484
--- #2. Envoy Air: 8,798
--- #3. Piedmont Airlines: 6,890

#3. Chicago O'Hare International (Chicago, IL)

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- Passengers: 41,246 (24.7% of all passengers)
- Top carriers:
--- #1. Envoy Air: 27,757
--- #2. Mesa Airlines: 12,557
--- #3. SkyWest Airlines: 932

#2. Dallas/Fort Worth International (Dallas/Fort Worth, TX)

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- Passengers: 46,943 (28.1% of all passengers)
- Top carriers:
--- #1. SkyWest Airlines: 43,326
--- #2. Endeavor Air: 3,617

This story features data reporting by Rob Powell, writing by Jaimie Etkin, and is part of a series utilizing data automation across 199 metros.

#1. Hartsfield-Jackson Atlanta International (Atlanta, GA)