The Federal Aviation Administration (FAA) has received a notice from the Alaska Department of Transportation indicating the permanent closure of the Haines, Alaska Seaplane Base (3Z9). The infrastructure for the seaplane base had been transferred to the City of Haines, and due to harbor expansion, it is no longer possible to host floatplane traffic. The closure is effective retroactively, and the FAA is releasing this notice in accordance with federal regulations.
Simple Explanation
The FAA wants everyone to know that the place in Haines, Alaska, where special planes called seaplanes used to land on water, is now closed for good because the harbor has been changed and can't fit the planes anymore. They got a message from Alaska's transportation people saying this, and now it's official.