Your reservation number (9 numbers) and a copy of your reservation suffice to check in for your flight.
When checking in online, you will receive a boarding pass either in PDF or in mobile format* which you will have to present at the airport.
- Will you only be taking hand baggage?
In that case, you can go directly to the security check and then on to the gate if you already have your boarding pass.
- Will you be taking checked baggage as well?
Go to the check-in desk to drop off your baggage.
The seat reservation confirmation does not necessarily have to be presented, but can be useful in case of irregularities.
* for Android users, the PassWallet app is required.