Any Unknown or Unlisted Aircraft Manufacturer
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 5.0
Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Other / Unknown
Air Traffic Control Issued Advisory / Alert; Flight Crew Requested ATC Assistance / Clarification
Human Factors; Airspace Structure; Procedure
Aircraft X was doing parachute operations to an airport. I asked them to give me a 2 minute warning prior to release. The airway they operate on is one of the busiest routes [in the area]. It gets inundated with both IFR and VFR traffic daily. Holiday weekends are worse. Prior to Aircraft X giving me the warning I began calling traffic about Aircraft Y; who was transiting west to east along the airway. I called traffic a total of three times. I asked Aircraft X where he would be releasing the jumpers. He said right over the airport. I asked if it was ok with Aircraft X to put Aircraft Y about a mile or so north of the airport. Aircraft X replied in the affirmative. That's where I put Aircraft Y. Aircraft Y said he had the other aircraft and the jumpers in sight and I instructed him to resume own navigation.Aircraft X then says something to the effect of 'that guy flew right under me' to which I replied 'I told you where he was going; I asked if he was ok there and you said yes.' Then out of anger and disgust I terminated his services and frequency changed him. Hindsight being 20/20 there were other things I could have done; but at the same time it is a shared responsibility. I warned him about the traffic; and he acknowledged. I would recommend looking into the Aircraft X operation at ZZZ; this isn't the first incident with this company over the years. They have routinely been a problem in the airspace surrounding the airport. We have an LOA with them that they don't comply with. We have instructed them to hold jumpers due to traffic and they refuse.
ZLA ARTCC Controller reported they assigned a VFR aircraft a route to avoid a Skydiver aircraft; but the Skydiver aircraft reported the VFR traffic flew underneath them.