Date: 202102
Local time of day: 1201-1800
Location: SCT.TRACON, CA
Aircraft: Beechcraft / Beech Aircraft Corp Undifferentiated or Other Model
Operator: Other unknown
Operating under: Part 91
Flight plan: VFR
Mission: Other unnkown
Flight phase: Descent
Airspace: Class E ZLA
Second aircraft: Commercial Fixed Wing
Reporter organization: Government
Reporter function: Departure; Approach
Reporter qualification: Air Traffic Control Fully Certified
Human factors: Situational Awareness; Workload
Anomaly: ATC Issue All Types; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Air Traffic Control
When detected: In-flight
Result: General None Reported / Taken
Contributing factors: Aircraft; Airspace Structure; Human Factors
Primary problem: Airspace Structure

Narrative: I was working the Springs sector and noticed a high performance aircraft depart PSP and then the tower dropped them and they went to a 1200 code.  I kept my eye on them because we have had high performance aircraft interfere with arrivals/departures before. Over the next 30 minutes; the aircraft flew around the airspace; but it wasn't until around XA:45z that they started doing maneuvers around UDD.  I believe it was Aircraft X that was doing aerobatic maneuvers just east of the UDD airport.  The aircraft rapidly change altitude; turn very quickly; and all of this at a high rate of speed.  It's next to impossible to anticipate what their intentions are and makes it very difficult to keep other aircraft out of their way. These aircraft fly through the airspace; creating havoc; and then just call the tower for pattern entry; instead of calling approach for sequencing.  One of the aircraft was right next to a regional jet; but below; and keeping up with them; while they were trying to descend on a visual approach in to PSP.  This aircraft called the tower; instead of approach; and was sequenced by them.  I; however; was left focused on the situation; unsure what this aircraft was doing; and if they even saw [the regional jet].The lack of a mandatory controlled airspace in the PSP area makes it very difficult to make any sort of plan; since anyone who wants to can fly right down the final legally.  PSP tower is also terminating these high performance aircraft; right as they leave their Delta airspace; where they go on to get in the way of arrivals coming in PSP or other nearby airports.  These high performance aircraft are out every weekend; constantly getting in the way; and making the approach controllers bend to their will.  The workload on the Springs sector is already very high; but add in the lack of guaranteed controlled airspace makes everything much more difficult.  We are approach; departure and clearance delivery; all in one sector.  It is incredibly frustrating to make sense of all the aircraft criss crossing; formulate a plan; and then have someone who deems it not important to participate in the TRSA; blow up your entire plan; making you change everything.  While that did not happen exactly in this instance; it has happened many times before; and is what has brought me to file this report in hopes to prevent it from happening more.I recommend that we change the airspace around PSP to something that is mandatory controlled airspace.  The voluntary participation makes sequencing and separation difficult; and in the cases of these high performance aircraft; they are creating an unsafe situation; but still 'following the rules'.  Some sort of protection needs to be added to the area to help us ensure our separation and allow controllers to have a safe space to sequence.I would also request that someone look in to the legality of the aerobatic activities that these aircraft are doing in the Palm Springs valley.  Are they aware what they are doing is unsafe and potentially illegal?




Synopsis: SoCal TRACON Controller reported an unsafe situation with VFR aircraft and IFR aircraft within close proximity to each other just outside the PSP Class Delta/TRSA.