| 1 | SEL | Sentel Corporation | Callsign: Sentel, | USA | AVCODES |
| 2 | SEL | Selectair Ltd. | Callsign: Selectair, | GB | AVCODES |
| 3 | SEL | Sentel Corporation | | | ICAO1 |
| 4 | SEL | Schlünß Eisenbahn Logistik | | D | TRAFFIC |
| 5 | SELA | SEL-LO OIL INC | | | SCAC4 |
| 6 | SELC | SEABOARD LIQUID CARRIERS LTD | | | SCAC4 |
| 7 | SELD | SELLAND AUTO TRANSPORT INC | | | SCAC4 |
| 8 | SELF | SELF HEATING & COOLING INC | | | SCAC4 |
| 9 | SELG | SEGARRA ENTERPRISES LTD | | | SCAC4 |
| 10 | SELH | SEA LANE EXPRESS LLC | | | SCAC4 |
| 11 | SELI | SELLS SERVICE INC | | | SCAC4 |
| 12 | SELJ | STINE, ELAINE TRUCKING INC | | | SCAC4 |
| 13 | SELK | Selkent | | GB | TRAFFIC |
| 14 | SELNEC | South East Lancashire North East Cheshire Passenger Transport Executive | City: Manchester | GB | TRAFFIC |
| 15 | SELRWOP | Independent Reconnaissance Aviation of the Border Protection Forces | | PL | TRAFFIC |
| 16 | SELS | SOUTHEASTERN LOGISTICS SOLUTIONS LL | | | SCAC4 |
| 17 | SELU | SEACO SRL | | BDS | BIC |
| 18 | SELV | SHEAR TRANSPORTATION INC | | | SCAC4 |
| 19 | SELX | Selby Refrigerator Car Co. | 7/1932 | | NAKINA |
| 20 | SELX | Seattle Export Lumber Co. | 4/1938-1/1941 (not listed) | | NAKINA |
| 21 | SELX | *SHELBY REFRIGERATOR CAR CO. | | | PWRC |
| 22 | SELX | *SEATTLE EXPORT LUMBER CO. | | | PWRC |
| 23 | SELX | +STELCO, INC. | | | PWRC |
| 24 | SELX | STELCO INC | | | SCAC4 |
