I called them the night before I needed a ride. It was no problem for them to schedule me for an early pickup the next morning. The trip to the airport was perfect. Fairley (the owner, I believe) was early and the car was spotless. The trip was $45, including gratuity.
I'm so glad I paid a couple extra bucks to take a towncar to the airport instead of a cab. I will definitely be using Time Car next time I'm in Charlotte. The reliability alone is worth the peace of mind.