 Not necessarily. Even if you check in online the night before, there's no guarantee they're going to hold a seat for you, and there's no guarantee your bags are going to make it onto the flight that you're booked on. The airlines have changed the times on cutoff times. It used to be 60 minute, excuse me, 45 minute cutoff times for checking in bags at the airport. Some airlines now have moved that to 60 minutes, and they haven't told you. And then,