NORTH ADAMS — Asher Rabquer drove his son Isaac up to the front of Harriman-and-West Airport a few times in recent years, peering through the gate separating them from the tarmac to see if they could catch any plane sightings and snap some photos. On Thursday, the father and son got to see some aircraft up close, along with mom, Emily, and daughter, Lucy, at the airport’s recent open house under new management, Hewison Aviation.