CNN The Situation Room March 12, 2014 21:39:00
Basically the lightest pieces. the heaviest pieces sink. the lightest pieces are usually the wings and the tail and there's no part as far as i can see in the dimensions in the 777 where those metal parts conform to those sizes. they're very big square sizes. the most rugged part of a plane, the part that never breaks apart whatever happens to it virtually is what's called the wing box, the wing joints and fuselage. that's sometimes found in one piece but that's nothing like this size or shape. so i'd love to think this is really the wreckage, and as richard says it's in the right place, seems...
Source: archive.org