Creative Speculation

You have several options here some ideas taken from thread; none of these ideas are my ideas.
1) Real plane crash brought down when passengers fought back. Everyone dies. DNA evidence real. NTSB evidence is real.

2) Real plane crash where the hijackers brought it down. Everyone dies. DNA evidence real. NTSB evidence is real.

3) Real plane crash shot down by military (I thought this was where you were going). Everyone dies, even the fighter pilot to keep the secret. DNA evidence real. NTSB evidence is real.

4) Real plane crash, empty remote control plane, passengers taken out, given new identities. DNA evidence faked. NTSB evidence is real.

5) Real plane crash, empty remote control plane, passengers taken out, told they are to be given new identities but are then killed. DNA evidence real. NTSB evidence is real.

6) Fake plane crash where a salvaged plan's parts are buried to be dug up to support theory #1. Passengers taken out, told they are to be given new identities but are then killed. DNA evidence real. NTSB evidence is real.

7) Fake plane crash. NTSB completely fakes everything and the passengers and hijackers never existed in the first place except for the actors who played their parents and relatives when they listened to the supposed cockpit recording.

As I was writing this, I thought halfway through that it would be better to start with the smallest number of people needed to keep this a secret and have that number expand as you went down the list but I don't care enough.

Your theory please.