There’s an app for that.
Have the airline app on your phone for easy access to flight status and checking-in. Keep all your travel info on your calendar with alerts.
It seems the policies about cancellations and luggage are always changing. Be sure to check the airlines policies so if something happens you will get a credit or refund. Some airlines now charge for carry-on's along with checked luggage. Knowing ahead of time can keep you from being unpleasantly surprised.
I always have something to read with me. Whether it's waiting to board the plane or having a flight delay, it gives me something to do and I actually enjoy having the time to sit and read. You also may want to pack a snack. Depending on when you are flying, it's easy to miss a meal so staying fed and watered is important, especially because you could end up hangry, and no one needs that while traveling.