| ALASKA | CLF | CLEAR SKY LODGE |
| ALASKA | CLS | CHEHALIS-CENTRALIA |
| ALASKA | CLP | \ |
| ALASKA | CLM | PORT ANGELES, WA WILLIAM R. FAIRCHILD INTL |
| CALIFORNIA | CLR | CALIPATRIA CLIFF HATFIELD MEM |
| FLORIDA | CLW | CLEARWATER AIR PARK |
| NORTH CAROLINA | CLT | CHARLOTTE-DOUGLAS INTL |
| OHIO | CLE | CLEVELAND-HOPKINS INTL |
| OKLAHOMA | CLK | CLINTON RGNL |
| TEXAS | CLL | COLLEGE STATION EASTERWOOD FLD |
| WASHINGTON | CLS_1 | CHEHALIS-CENTRALIA |
| WISCONSIN | CLI | CLINTONVILLE MUNI |