Port Alexander Seaplane Base (IATA: PTD, ICAO: PAAP, FAA LID: AHP) is a city owned, public use seaplane base located in Port Alexander,[1] a city at the southeastern corner of Baranof Island in the Petersburg Borough of the U.S. state of Alaska.

It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation facility.

[4] Scheduled airline passenger service is subsidized by the United States Department of Transportation via the Essential Air Service program.

Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, Port Alexander is assigned AHP by the FAA[1] and PTD by the IATA.

For the 12-month period ending December 31, 2006, the airport had 325 aircraft operations, an average of 27 per month: 77% air taxi and 23% general aviation.