| 1 | YC | Trygg-Flyg Erik Trygg AB | ICAO: TYG, Callsign: Trygg, Designator YC recalled by IATA | S | AVCODES |
| 2 | YC | Flight West Airlines Pty Ltd. | ICAO: FWQ, Designator YC recalled by IATA | AUS | AVCODES |
| 3 | YC | Caverton Helicopters Ltd. | | WAN | AVCODES |
| 4 | YC | Yamal Airlines | ICAO: LLM, Callsign: Yamal, IATA Prefix: 664, Designator YL recalled by IATA. Designator YL reinstated by IATA | RUS | AVCODES |
| 5 | YCA | YELLOW CAB COMPANY | | | SCAC4 |
| 6 | YCBC | YELLOW CAB COMPANY | | | SCAC4 |
| 7 | YCCR | YANKEE CARTING CORP | | | SCAC4 |
| 8 | YCCU | DALIAN ZIQI CONTAINER MANUFACTURING CO., LTD. | | PRC | BIC |
| 9 | YCDA | YELLOW CAB | | | SCAC4 |
| 10 | YCEU | INTER-CONTINENTAL EQUIPMENT, INC. | | | PWRC |
| 11 | YCEU | Inter-Continental Equipment | | | RSRV |
| 12 | YCIN | YOCUM OIL COMPANY INC | | | SCAC4 |
| 13 | YCLB | YOURFREIGHTRATE.COM LLC | | | SCAC4 |
| 14 | YCLW | YUSHIP CO LTD | | | SCAC4 |
| 15 | YCMZ | YELLOW CREEK MINE | | | PWRC |
| 16 | YCOI | YODER & CO INC | | | SCAC4 |
| 17 | YCPU | JIANGSU YANCHENG PORT CONTAINER GROUP CO.,LTD | | PRC | BIC |
| 18 | YCR | YCR CORP | | | SCAC4 |
| 19 | YCSN | YO COUSIN | | | SCAC4 |
| 20 | YCTB | Yokohama City Transportation Bureau | City: Yokohama | J | TRAFFIC |
| 21 | YCTC | YC TRANSPORTATION INC | | | SCAC4 |
