https://notams.aim.faa.gov/notamSearch/nsapp.html#/details
General Aviation and non-scheduled Aircraft arriving at Las Vegas, NV (KLAS), check NOTAMs for PPR (Prior Permission Required) information. FBO Parking is limited. Check NOTAM and call the published phone number for information.
Aircraft operators not permanently based at LAS-VGT-HND need to obtain a PPR number from an FBO for each landing during high volume operations to have full operational use of the airport runways, taxiways, aprons, facilities, and services. Landing clearances may be denied.
PPR approval and confirmation numbers can be obtained from the selected FBO at 702-261-7775. PPR confirmation numbers should be entered in the remarks section of each flight plan.
https://www.faa.gov/air_traffic/publications/atpubs/aip_html/part3_ad_2.0_nevada.html
Please check NOTAMs, and if you still have questions:
ATO POC: Kevin Schlieper Kevin.Schlieper@faa.gov (725) 600-7032
or, Las Vegas Air Traffic Management Unit (LAS TMU) (725) 600-7010