Yesterday we used the early bag checkin option at the Airport Car Rental Return Center. It was fast and so nice not having to carry heavy bags on and off a shuttle bus to the terminal.
Tip: It should be noted that for the Car Rental Return Center you now
need to check the bags at least two (2) hours ahead of your flight's scheduled takeoff time. Other early checkin locations in the airport might be 90 minutes ahead, but not here.