Moreover, I don't believe that Abbadon is connected with Oceanic at all as he claims when he visits Hurley in the mental institution in the first ep of season 4. I think that's a cover and that he really works for Widmore. However, I wouldn't put it past Widmore to have gained some sort of blackmail/control over Oceanic Airlines in connection to the crash. i.e. putting the false plane crash at the bottom of the ocean.

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Namaste - I recognize and honor God within you!