I happened to catch a glimpse of one of the Mirage Gulfstream’s and it sparked my interest.
The MGM Mirage have the following
N720MM is a 737-700 but hasn’t moved since under that N number since. October.
Wynn Resorts has a few apparently…
Possibly the Venetian
What about Mandalay Bay? Bellagio? I’m pretty sure the Maloof Brothers (The Palms) have a Gulfstream but can’t find any info on it.