McCarran GA
McCarran does service GA aircraft. Signature Aviation is right off of 19R abd the strip is right out their front door. There is a downside though, I was there last week and they were asking $3.20 a gallon for 100LL and there is a $20.00 tie down/ handling fee. That fee is $35.00 for overnight if you do not purchase fuel.
Better to fly into N. Las Vegas, no tie down fee, cheaper fuel and a free shuttle to and from the strip. Signature is convenient though, the Mandalay Bay hotel is right outside the front door.