An itinerary is a tidy document. It carries flight numbers, seat assignments, a hotel confirmation and a return time. What it almost never carries is the last twenty minutes of the trip, which is the walk to the parking structure and the drive home. For most travelers that is fine, because most of the time the car starts.
A car parked at an airport for ten days has been sitting in the heat, unmoved, with a small parasitic drain on the battery. In a Las Vegas summer that adds up. So does a slow tire leak that was nothing on the way out and is flat on the way back. The timing is what makes it awkward. You land late, the shuttle has already run, and the people you would normally call are asleep.
Keys are the other recurring one. Travelers put a spare set in a checked bag, then the bag goes to the wrong city. Or the only fob went into a jacket pocket now hanging in a hotel in another time zone. Lockouts and jump starts are unglamorous services, and they are the two most likely reasons a trip that went perfectly ends with somebody standing in a parking garage at midnight.
Frequent flyers develop a private taxonomy of this. There is the return that goes exactly as planned, the return where the car needs a jump, and the return where the car is fine but the parking level has been forgotten. Business travelers who leave a vehicle for a week at a time will eventually meet all three. It is worth treating the ground portion as part of the itinerary rather than as an afterthought bolted onto the end.
There is also the reverse case, which comes up more than you would expect. People fly one direction and need a vehicle moved the other, after a relocation, a purchase out of state, or a car that cannot be driven back. Las Vegas Towing lists local and long-distance vehicle transport alongside jump starts, lockout service and tire changes, and its stated service area covers Las Vegas and the surrounding Clark County areas. Anyone who parks long-term before a flight can look at what the company handles across the valley and save whatever is relevant before the outbound leg.
Two habits make the ground leg boring. Before a long trip, drive the car enough to know the battery is healthy, and check the tire pressures including the spare. Then put a towing number in your phone under a name you will actually find at midnight. Write the parking level and row in the same note, because that is the detail people lose first.