- A harbour airport, also known as a seaplane base, is an airport located on the water, typically a bay or harbour, where seaplanes can take off and land. These airports are designed specifically for seaplanes, and usually feature docks or ramps that allow easy access to the water. Harbour airports are used in areas where waterways are the primary means of transportation, such as remote coastal areas or islands. They provide a convenient and efficient way to transport people and goods, as seaplanes can land directly on the water and do not require a traditional runway. Some well-known harbour airports include the Vancouver Harbour Flight Centre in Canada and the Lake Union Seaplane Base in Seattle, USA.