App In The Air

There are plenty of apps out there that aid you with your flight, but App in the Air is definitely part of the elite. After giving information about your flights, or simply connecting accounts that hold such information, it will automatically notify you about departure, arrival, flight status changes, delays and more. It also helps you find your way across the airport and checks you in automatically.
Additionally, the app notifies your family/friends about changes in your flight, if that is what you wish for.

App in the Air is free to download, though some features are paid features. The paid version is an annual subscription which costs €30 per year.

I personally find App in the Air a great help and makes your life easier. However, the price of €30 per year is quite high and if you don't travel a lot, it is probably not worth it for you. The free version is really good too and should be enough for your desires most of the time.