The 20-store Pak-A-Sak chain headquartered in Amarillo, Texas, got its first drive-thru in 2008. Because the handy window was a big hit with customers, “We went back and remodeled a couple of the stores to add drive-thrus, and that really improved sales for us,” said Brian McKee, vice president of merchandising and co-owner of the company along with his two brothers.