Orhan Cam // Shutterstock

- Passengers: 14,027 (14.2% of all passengers)
- Top carriers:
--- #1. PSA Airlines: 14,027

#4. Ronald Reagan Washington National (Washington, DC)

Songquan Deng // Shutterstock

- Passengers: 14,308 (14.5% of all passengers)
- Top carriers:
--- #1. TEM Enterprises dba Avelo Airlines: 14,308

#3. Orlando International (Orlando, FL)

marchello74 // Shutterstock

- Passengers: 30,958 (31.3% of all passengers)
- Top carriers:
--- #1. Air Wisconsin Airlines Corp: 16,386
--- #2. Envoy Air: 14,500

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

Vladimir Mucibabic // Shutterstock

- Passengers: 35,099 (35.5% of all passengers)
- Top carriers:
--- #1. Endeavor Air: 31,891
--- #2. SkyWest Airlines: 3,208

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. Detroit Metro Wayne County (Detroit, MI)