According to the National Park Service,

The single engine floatplane, a deHavilland Beaver operated by Branch River Air Service in King Salmon, carried the pilot and three National Park Service maintenance employees and has been missing since Saturday afternoon, August 21, 2010. The missing employees are Mason McLeod, 26, and two brothers, Neal Spradlin, 28; and Seth Spradlin, 20. The pilot is Marco Alletto, 47, from King Salmon.

Searchers have returned to the northeast part of the 4 million acre national park, particularly the several river valleys that drain into Kamishak Bay. The expectation was that the plane would have flown up one of the valleys, then along Kulik Lake west toward King Salmon. The weather in the primary search area today is excellent, with largely clear skies and excellent visibility.

The search began late Saturday afternoon after the Beaver failed to return to King Salmon. Two planes owned by Branch River Air Service in King Salmon flew to Swikshak Lagoon on Saturday to pick up an NPS maintenance crew working there preparing for the reconstruction of an old ranger station. Three people were picked up by the Beaver at 1:45 p.m., and a second plane left Swikshak 15 minutes later. The second plane, with two employees and pilot on board, returned safely but had to fly much of the way 500 feet above ground level due to deteriorating weather conditions.

An emergency response was initiated through the Rescue Coordination Center on Saturday afternoon. A C-130 from Anchorage and a Coast Guard helicopter searched the area until 11 p.m. Saturday, but found nothing.|

There have been no radio or emergency locator transmitter transmissions.