PICTURED: Father-of-two pilot, 46, who died when two tourist planes crashed ...

A pilot who died in the fatal collision of two sightseeing sea planes in Alaska has been identified.

Randy Jason Sullivan, 46, was piloting the de Havilland DHC-2 Beaver owned by Mountain Air Service that collided with a larger de Havilland Otter DHC-3 on Monday afternoon in Ketchikan, Alaska.

Sullivan was among the four people killed in the crash, family members confirm. Two people are still missing and ten survived the collision with injuries.

According to his mother, Sullivan had been a pilot with Mountain Air since 2012, flying tour groups over the rugged wilderness of Alaska's Inside Passage, a popular cruise ship route. 

Federal accident investigators said the larger of the two flightseeing floatplanes involved in the deadly midair collision had rapidly descended in altitude when it collided with Sullivan's aircraft.

Spokesman Peter Knudson with the National Transportation Safety Board says the larger of the planes, a single-engine de Havilland Otter operated by Taquan Air, was initially traveling at an altitude of about 3,800 feet.

He says the plane had descended to an altitude of 3,200 to 3,300 feet when it collided with the smaller plane, the Beaver piloted by Sullivan, as both planes headed to Ketchikan with cruise ship passengers. 

Knudson says the Beaver had been flying at a 3,300-foot altitude.

Three survivors of the horror plane collision were released from PeaceHealth Ketchikan Medical Center on Tuesday, hospital officials said.

Hospital spokeswoman Marty West says three others are in fair condition.

Four others were initially treated at the hospital following Monday's collision of two sightseeing floatplanes. 

Those survivors were later flown to Harborview Medical

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