Things in air travel did not go back to normal though. Cockpit doors were reinforced, with nobody allowed in during flights. Things on the ground were even mo

Things in air travel did not go back to normal though. Cockpit doors were reinforced, with nobody allowed in during flights. Things on the ground were even more changed, with security still heightened to this day (even if much of it is theatre). AFAIK, it was also around then that tickets became non-transferable. People's luggage can no longer travel with out them. We have 3D body scanners and can only carry small quantities of liquids in a tiny bag (I realise this came a bit later, but the point stands). Being brown results in even more unpleasantness. Things absolutely did not return to normal after 9/11.