When you rent a car, I bet you don’t give much thought into the times you say you’ll pick up and drop off the vehicle. Most people enter in the time their flight is due to arrive and then maybe give themselves an hour, or two, before your flight is due to leave. But what if your flight home is delayed and you know you’re going to be stuck at the airport? You might decide to just show up a bit later. What if you change your arriving flight at the last minute to get on an earlier plane? Those decisions could cost you an entire day worth of rental car charges, if you’re not careful.