Okay not many hotels offer free shuttles from Mc Carren Airport to their properties one that does is the Palace Station which is a locals casino located just off the north end of the strip. The service begins at 6am and ends at 11:30pm every day. You must be a hotel guest or slot club member to use this shuttle and yes they do check. To pick it up at the airport its on level zero between stalls 21 and 23.