MD-80 Series (DC-9-80) Undifferentiated or Other Model
Air Traffic Control Fully Certified
Other / Unknown
ATC Issue All Types; Conflict NMAC
General None Reported / Taken
Procedure; Airspace Structure
I was working the Pima and Willy sectors combined. These sectors get combined often so it was not unusual for this to happen. I had moderate to heavy traffic with an MD80 inbound to IWA on the HUUTY1 RNAV. The MD80 had the airport in sight and I cleared the aircraft for a visual approach estimated 19 miles from the airport. There were lots of aircraft on frequency; and two different drop zones at other locations were calling for their required skydiving operations calls. The MD80 approximately 15 miles northeast of IWA reported seeing a possible skydiver below him. I informed him that the closest VFR target was at least 14 miles away. I then switched The MD80 to IWA Tower frequency. I then reported the possible skydiver sighting to management and noticed a collision alert with the MD80 and an untracked VFR tag that was approximately 5 miles northeast of IWA at 037. This was on the boundary of IWA's Delta and I elected to not call IWA since it was on the very border of their airspace and the MD80 had been on their frequency for some time. I was informed later that the MD80 reported a near mid air collision with the VFR aircraft not talking to me or IWA Tower. IWA has no protection from VFR aircraft flying in the immediate vicinity. Three different airlines; multiple military aircraft; and various corporate jets fly in and out of the airport and it is my feeling that a Delta airspace does not provide the protection needed to accommodate safe aviation activities. VFR aircraft litter the area and some of which are aerobatic and the result is multiple Resolution Advisories and close calls. The warning signs are there; and it is known that East of IWA is dangerous.  Multiple VFR aircraft at higher MVA's makes separating aircraft difficult.
P50 Controller described a reported NMAC between a IWA Air Carrier arrival and a VFR aircraft operating near or in Class D airspace; the reporter noting the existing airspace does afford the needed safety for IWA operations.