Originally Posted by
SkOrdBgo
If you have a same-ticket connection (I.e., EWR-OSL-ARN on the same ticket), there is a transfer gate near the top of the stairs (before going down to the baggage claim area). If you go through that e-gate, you will not go out and re-enter through security again.
There is a separate Schengen and domestic area at OSL.
Except that is security, and hence you’ll have to go through to security again. OSL treats all non-Schengen arrivals the same.