Mandalay Bay does not have a shuttle service to the airport. The airport runs the shuttle service to the hotel.
you certainly can take a car service or public transportation to the airport, but since they had two cars...?
It’s not like they were tourist needing rides.
I think she left for the airport from their house not the hotel. He probably went to the hotel after she was off to the airport on the 25th and stayed until the massacre.
It doesn’t matter whether Mandalay or AirShuttle runs the shuttle. She could have ordered one to pick her up from the hotel. That way, her car wouldn’t be stuck in airport parking at $30/day for 2 weeks, he could gamble and then drive the car home later. (and, if she thought he was breaking up with her, why leave the car at the airport when she might not be back, ever? Easier to sell it sitting in front of a house)
So, a parking chit doesn’t mean anything. We need to know if Paddock physically checked in on the 25th, not just went there for the day.