mickjoebill
On the other hand, in previous acts of aviation terrorism were false or stolen identity documents used?
Yes, they were.
I mentioned the WTC-1993 bomber who did some trial/test runs using an Italian fake passport, who also had several other fake IDs laying around when police investigated. Air India bomber used a fake and/or incomplete name. Lockerbie bomber - I don't know what name was used for that, but it wasn't the man convicted.
Air France hijack in Algeria, the hijackers faked police IDs to gain access to the plane.
The new EU passports are hard to fake - much easier to steal and use, hoping for a sloppy bureaucracy to fail to nullify the passport ID number. Photos and person data is engraved into a special laminated paper, so IF you manage to get hold of such a passport AND it slips through the bureacracy I venture a guess that noone will suspect that the long-nose in front of them isn't the long-nose on the passport pic (which, btw, can be years old and very very very unflattering anyway).