Anacortes Airport (IATA: OTS, FAA LID: 74S) is a public use airport located two nautical miles (3.7 km) west of the central business district of Anacortes, a city in Skagit County, Washington, United States. It is owned by the Port of Anacortes. Many U.S. airports use the same three-letter location identifier for the FAA and IATA. However, this airport is assigned 74S by the FAA but has been assigned OTS from the IATA.