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An even better explanation:
In the final act Donnie figures out how to build a portal and pull the engine off his mom's return flight. We are not shown all the ways he does this, but when he does, time reverses for those 28 days, back to midnight October 2. Gretchen and Frank are alive again, the house has not burned, the teacher was not fired, the "proper" universe has been restored and the parallel universe non-existent. But the jet engine still falls at midnight, Donnie is in his bed. He has sacraficed his own life for everyone else, saving the whole world.
Lux
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