The moment they showed the plane underwater with the bodies on board, I knew this was really the same plane and the same Losties we know, but these ones were all killed in the crash. I am going to hold to that, because one of the items on Faraday's notebook was a sketch that showed, among other things, several different time "zones" for lack of a better term - one of which was "real space" (the real world) and one which was "imaginary space" (our favorite Island). To me, imagination is a place where anything is possible...

I would be very disappointed if it turned out Ben was telling the truth about Widmore planting the plane wreckage. Besides, who here believes he ever really tells the truth?

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“Because, in a land of predators, the lion never fears the Jackal.” – Dexter S3E03 “The Lion Sleeps Tonight”