but they are not the same time the are parallel times. They are 2 different times. Timeline 1 and Timeline 2.
Timeline 1 2007 = Ajera flight, Jacobs death, Losties in Temple on island
Timeline 2 2004 = island under water, Losties (the ones we saw) safe in LA, so when timeline 2 reaches 2007, they can't be on the island.
What ever happened in timeline 1 happened.
What ever happened in timeline 2 happened.
No paradox...2 separate realities that diverged from 1 reality in 1977 when the bomb went off.
Timeline 1 is not linear. It includes the first 1977-2004 that the Losties lived off island and then their return to 1977, the bomb and their jump to 2007. It also includes the Oceananic 6's off island time from 2004-2007
Timeline 2 appears to be linear.
Did they really land at LAX? The producers have said using LA X (with a space) was 100% intentional. Perhaps the plane didn't land in Los Angeles at all?