"Southwest Airlines's Marriott code SW8 is an airline employee code. Airline employee IDs are physical company-issued badges — well-recognized by hotel staff at airport corridor Marriott properties. Properties near Southwest's Dallas Love Field HQ, Phoenix, Baltimore, Denver, and Las Vegas hubs are most likely to verify. FlyerTalk's general airline employee code thread: "Airline codes are more likely to be checked than random corporate codes because the front desk knows what an airline badge looks like." No SW8-specific denial documented."

"I work front desk and it seems like management is really pushing to check IDs for any special rate. Personally im lazy and also don’t care that much to start a confrontation so I only verify govt rates and employee rates, but yes it is being enforced more harshly. Corporate rates I guess are easy to find online and thus abused. Again, I don’t care that much because they’re still pricey anyway !!"

"I now always make it a matter of course to carry documents (business cards of my contacts, e-mails requesting my visit etc.) from my host company when I travel. This has always proven sufficient for the few times I've been challenged by the front desk clerk."