Waiting to get through airport security brings out the absolute worst in me. There's something about having to take off my shoes and jacket and remove my laptop from its sleeve that turns me into the most unpleasant human being. And each time I fly, which is pretty often, I always regret not signing up for TSA Precheck. The process from start to finish can be a pain, but the fact that it makes traveling less painful is totally worth the hassle. After reading this, you're going to facepalm yourself like I do every time I realize that I should've signed up a long time ago.
Once you receive your KTN, add it to the corresponding field next time you book your flight online and enjoy your new perks!