Icelandair....
daikilo,
Icelandair is able to fly to Trondheim on the Norwegian west coast today due to the fact that the airspace in NW Norway has been opened - at least for now (acc. Norwegian newspaper VG.NO).
The Icelandic airspace is not closed apart from the area directly affected by the eruption. That's why Icelandair has been able to continue flying to their US destinations.
SAS' main international hub is Copenhagen - but flying to/from Denmark is not possible, as airspace closed from ground and up - even for VFR traffic.