Hi TOFFAIR,
According to sources, the consensus seems to be a fleet of the single aisle airbus family and 4x E190s. So, it seems you are in the right place.
Also, as far as I can tell, NAS represents the combination of NetJets ME and a low cost airline all under one roof, NAS.
Check it here:
Nas Air (Saudi Arabia) - Wikipedia, the free encyclopedia
I think this is accurate.
SJ