"Northrop Grumman's Marriott code NOR is a major defense contractor code. Defense contractor employee IDs are classified security badges that staff recognize. Properties near Northrop Grumman facilities (Los Angeles, Falls Church VA, Melbourne FL, Huntsville AL) are most likely to encounter genuine Northrop employees. FlyerTalk's defense code thread: "Security badges from defense firms are hard to fake and staff know the look." US full-service properties near defense installations: 15-25% verification rate. Select-service: minimal."

"I regularly stay at a renaissance once a month on our DTC rate and have done mobile check in but always end up at front desk. One time the front desk was like oh. We know you as you have been coming regularly, but I need to double check your id. I think it’s because someone shared it online and now it causes random checks for rest of us."

"I always see people saying that they aren’t able to do mobile check in. I’ve only stayed at two Marriott hotels where I tried to do mobile check in ( both of them never been to before) and they both let me without having to go to the front desk which I was really happy about because I had lost my ID and didn’t know how I was going to check in. Also I think I only had about 20 nights at the time, I usually stay with my boyfriend because he’s titanium."