American travelers can now keep shoes on during airport security as millimeter wave technology effectively detects threats that older systems couldn't identify.

While shoes can now stay on at airport security, the following items still need to be removed from your body or luggage: Additionally, any carry-on liquids, gels and aerosols still must abide by the "3-1-1" rule: It is also important to empty miscellaneous items from your pockets, such as keys and wallets.