TODAY   |  March 11, 2014

Aboard a plane searching for Flight 370

NBC’s Keir Simmons goes aboard a military transport plane helping with the mission to find any sign of Flight 370. There is still no sign of any wreckage.

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This content comes from Closed Captioning that was broadcast along with this program.

>> reporter: the latitude and longitude where the flight was last heard from. it was several hundred miles east of this airport where the aircraft took off from, over the south china sea . as you say, today we were given the opportunity to go on board one of these search and rescue missions. we were on a military transport plane that has been helping with this desperate mission. we took off from the air base in malaysia , searching for an aircraft now missing for days. the heart of the operation, to find out what happened to flight 370. the water stretches out on either side of us. you can see ocean on this side, ocean on that side. the malaysia straits is 705 kilometers. the malaysian air force tea party scoured the ocean. while we're in the air, they make contact with six other airplanes. we are flying over the ocean of the coast of malaysia , well below 1,000 feet. it is calm down there. you can see everything, but no sign of flight 370. the flight took off from kuala lumpur , heading for beijing. the initial search concentrated off the eastern coast of malaysia , now expanded west, taking in the strait of malacca, where we searched today. another day without success. how frustrating is it that we still haven't found the aircraft?

>> it is upsetting.

>> reporter: this team has been out over the water now for four days. they will keep going. while they say this is still a search and rescue mission, they simply hope to find out what happened. and at one point, the aircraft flying low turned and turned and turned around what looked like some debris on the ocean. we thought that we might have seen something. in fact, that turned out, as so many sightings have, to be debris left by fishermen. and matt, in eight hours up there, we were able to search 50 kilometers of ocean. this is a big area, and it is taking a long time, matt.

>> all right, keir simmons on the story, as well. thank you very much.