You do not have one.

Security clearances come in levels and types, and even a basic Secret clearance requires considerable paperwork. Moving up to a Top Secret clearance involves a process that can take several months under the best circumstances, and up to a year. Federal investigators will interview you (and your family/spouse), and most aspects of your life will be closely examined. It's an expensive process, and one which an employer must sponsor. Only employers authorized to seek a security clearance can do that, so unless you've worked for a defense contractor or for a contractor (or the military) and have been involved in an operation which requires a particular level of clearance, then you won't have been through the process.

Your airline experience requires a background check, which is minimal.