We got to the airport about two hours early and spent about half of that time in security. Once we got to the security machine we realized that the line we had been waiting in was actually the easy part. The TSA agents told us that everything had to go through the scanners: the stroller, car seat, car seat base, car seat/stroller bags, diaper bag and baby back pack. In other words we consumed a lot of time and space in the line. Another reason it took us so long was that my Hawaiian bracelet wouldn't come off so one of the agents had to give me a "pat down." That was a great way to start a trip, hahaha.
Once we landed in St. Louis, we picked up the rental car and started the three hour trek to the Lake of the Ozarks.