In the evening news in Rúv they tell about research (based on models) that suggest that it is going to be less chance of large airspace disruption like took place in Eyjafjallajökull volcano eruption in the year 2010. Reason for that is the fact that volcano ash from Katla volcano is normally not as small (less then 1 micron in size) as the volcano ash from Eyjafjallajökull volcano. But this small size of the early ash cloud allowed it too travel longer and hang up longer in the air then from more common ash clouds.
The reason for this is because of the fact that lava from Katla volcano are mostly basaltic and would create Hawaiian eruption if no glacier was on top of Katla volcano. Ash cloud from Surtseyan eruption is more heavy, as the volcano ash particles are larger and more heavy.
This might be a good news for the air travel industry in Europe when Katla volcano starts erupting. But this might create issues for the area closest to Iceland anyway. Depending on wind direction.
The Rúv news about this. Use Google translate at own risk.
Kötlugos hefði ekki sömu áhrif (Rúv.is)