Post-9/11 Security Overhaul (2001-2002)
After the September 11 attacks, the U.S. created TSA and federalized airport security. Passengers faced new ID checks, shoe removal, and restrictions on liquids and sharp objects.
Airport security became a federal function with standardized screening procedures.
The post-9/11 security regime became the baseline for air travel for 25 years.
The e-gate rollout represents the first major shift away from the document-check regime established after 9/11.
