Johnny Rockets in the Flamingo Food Court has the advantage of drawing more customers by staying open late, & by employing young people with manners & helpful attitudes, regardless of location, in my experience.
My Cheeseburger was fresh & juicy, though Vegas-pricey. JR's has really good Fries, & the Hot Fudge Shake was absolutely sinful
A quick satisfying Lunch that lasted the few hours until Dinner.