I do not see a listing for an Admirals Club on aa.com; there is none.
The McCarran International / Las Vegas airport website is
here.
There is a United Airlines Club Concourse D, between Gates 33 and 35. Use elevator to access 3rd floor. $50 day pass for non-members.
The Centurion Lounge (American Express) is at Concourse D next to gate D4. Hours: 5:00am – 12:00am, AMEX Centurion Card free, or any other AMEX card and $50. Possibly the best lounge at LAS?
The Club at LAS, Concourse D, behind Juice Express and Las Vegas Fruits & Nuts. Diners Club, Priority Pass lounge. Hours 06:00 - 02:00 daily.
Web special: Get a Day Pass for
$19.95 - Save 33%
USO for military and families in the T1 Esplanade.
Howard W. Cannon Aviation Museum, T1 Esplanade - not a lounge, of course, but entertainment for some.
Soon - moving to the appropriate forum.