When going through airport security with a pet, including cats, they are typically required to go through the X-ray machine as part of the security screening process, which can be stressful for some animals. To make the process as comfortable as possible for your cat, it is essential to ensure that they meet the TSA pet carrier dimensions and that you are using a TSA-approved pet carrier, which can be brought through security and fit under the seat in front of you; additionally, you can request a private screening for your cat from the TSA officer at the security checkpoint.