List of the busiest airports in the United States Busiest US airports by total passenger boardings Medium hubs

| Rank_2012 | Airports_Medium_Hubs | IATA_Code | City_Served | State_ | _2012 |
|---|---|---|---|---|---|
| 41 | Louis Armstrong New Orleans International Airport | MSY | New Orleans | LA | 4293538 |
| 42 | Luis Muñoz Marín International Airport | SJU | San Juan | PR | 4204478 |
| 43 | San Jose International Airport | SJC | San Jose | CA | 4077644 |
| 44 | San Antonio International Airport | SAT | San Antonio | TX | 4036598 |
| 45 | Dallas Love Field | DAL | Dallas | TX | 3902521 |
| 46 | Pittsburgh International Airport | PIT | Pittsburgh | PA | 3889997 |
| 47 | General Mitchell International Airport | MKE | Milwaukee | WI | 3707890 |
| 48 | Southwest Florida International Airport | RSW | Fort Myers | FL | 3630737 |
| 49 | Indianapolis International Airport | IND | Indianapolis | IN | 3585246 |
| 50 | Memphis International Airport | MEM | Memphis | TN | 3359622 |
| 51 | Port Columbus International Airport | CMH | Columbus | OH | 3095360 |
| 52 | Cincinnati/Northern Kentucky International Airport | CVG | Covington | KY | 2927218 |