You need a valid passport when travelling outside of the Nordic countries. For more information, see The LFV Group website. 
At the check-in counter you are required to show you reservation number/ticket and passport (make sure the passport is valid). The maximum allowed dimension and weight for the checked in baggage varies. If you are unsure, please check with your airline company.
If your trip includes more than one flight on the same day you can check your baggage through to your final destination as long as all flights are included in the same reservation.
Book your seat onboard the aircraft (chartered trips only) with your travel agency.
When you have checked in and passed through security control you arrive in the departure hall and from there you board the aircraft. When boarding you are required to show your passport.
For rules regarding passports, see link to the Police
and the Swedish Transport Agency. 

