Authorities in Alaska are hoping a missing floatplane carrying a pilot and three National Park Service workers simply landed in a cove to wait out the area's abruptly changing weather.

Katmai National Park Superintendent Ralph Moore says he's concerned that there's been no radio transmission from the small plane, however.

The search for the plane continues Monday. Aircraft have been checking the area between Swikshak Lagoon and the plane's destination in King Salmon, about 285 miles southwest of Anchorage.

The park service has identified the passengers as Mason McLeod and brothers Neal and Seth Spradlin. The pilot hasn't been identified.

The workers were on their way to rebuild an old ranger station.