Overview
- The TSA has installed roughly 1,200 3D computed‑tomography scanners at about 300 U.S. airports as part of a multiyear modernization to improve threat detection and speed screening.
- The CT units have tunnel openings of about 24.5 inches wide by 16.5 inches high, which trims roughly 0.4–0.7 inches of clearance per side compared with older X‑ray machines.
- Any carry-on that meets common airline limits (about 22 x 14 x 9 inches) should fit, but soft or expandable bags packed to bulge, items in outer pockets, and bulky wheels or handles are the main causes of rejections.
- Local checkpoint responses differ: officers may manually inspect bags or use older scanners when available, but industry reports say directing passengers to check oversized bags is becoming common and can trigger same‑day fees and re‑screening.
- The CT scanners produce 3‑D images that let officers inspect contents without opening as many bags and allow travelers to leave laptops and travel‑size liquids packed, which is the core benefit driving the rollout.