"DaimlerChrysler's Marriott code DCX was the merged Daimler-Chrysler entity code (1998-2007 merger). The company later split back into Daimler AG and Chrysler. The code likely remains active in Marriott GDS with one of the successor company relationships. Auto industry codes at Marriott carry medium risk — properties near Auburn Hills MI (Chrysler HQ) and Stuttgart recognize auto company employees. FlyerTalk notes that European Marriotts verify auto company codes more frequently than US properties."

"I am very rarely asked to prove my eligibility for a rate...but they have every right to ask and if you can't produce it, you will be re-rated to the current rate, which is often even higher and there is no guarantee points rooms will be available. Doing online check in rarely helps this as most properties don't actually do online anyway - especially to people who are not returning guests to the property or elite. You are taking a gamble. One that is likely to be fine. But understand you are intentionally breaking the terms of the bonvoy program and if someone really cared, there can be consequences."

"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 !!"