| ALASKA | HYG | HYDABURG SEAPLANE |
| ALASKA | HYL | HOLLIS SEAPLANE |
| KANSAS | HYS | HAYS RGNL |
| MASSACHUSETTS | HYA | HYANNIS BARNSTABLE MUNI-BOARDMAN-POLANDO FLD |
| MICHIGAN | HYX | SAGINAW CO H.W. BROWNE |
| SOUTH CAROLINA | HYW | CONWAY-HORRY CO |
| TEXAS | HYI | SAN MARCOS MUNI |
| WISCONSIN | HYR | HAYWARD SAWYER CO |