But your express train tickets to the city centre near baggage claim carousel #6, near the toilets. The line here much shorter than at the train station.
Very expensive place))) free wifi you can get with your cellphone-number. From airport it would be cheaper to take usually train to Oslo Central Station (for 5 minutes longer than flytoget).
International departures: Go through security checks & straight into domestic terminal. No return after continuing into international terminal. Passport Control between duty free shops & boarding gate
Small Airport. Self service counters. Make sure to print your boarding pass because if you lost your luggage you need a printed copy for the Insurance claim.
The local nsb train room Oslo is almost half the price than fly to get but let's review the schedule on the TV panels near the ticket machines as it has less departures.
Don't waste your money on Flytoget. Domestictrains is fast (around 20 minutes to get to Oslo Center), easy to use and twice cheaper (80 nok vs. 170 nok)
Considering how efficient Norway is, this airport is a complete disappointment. Get here 3 hours in advance of your international flight to allow for long check in lines & passport control check