Somebody else already answered, but you are not correct. There is an element where the ‘characters...all died in the plane crash’ is included, but that is apparently not what happened. To say more is to provide a spoiler.
The origin of the Others (there is not just one group of them) is also a spoiler, which would ruin an entire season if said out. As I said elsewhere, go find the ‘Lost’ analysis threads if you actually want to know and are willing to read extremely long, intensely detailed studies, which trace the episodes shot-by-shot in order. I only read a few of them (having already seen the episodes) but I did find them interesting.
I appreciate the spoilers. The reason I didn’t wish to read through exhaustive threads was because I did not wish to waste too much time on the topic.
Thanks for the input.