"Shell's Marriott code SHL appears in FlyerTalk corporate code compilations. Shell is a global energy giant with major US presence in Houston TX. Marriott properties near Houston Energy Corridor routinely handle Shell employees. No specific verification-denial cases were found. The energy sector code pattern tends to be less targeted than tech company codes in current enforcement discussions."

"I work for a company that is partially owned by a Fortune 100 company and we have their corporate rate code linked to our travel website, (although it is one of the ones that is very easy to figure out). In 4+ years I've never been asked for any ID, although a few times a year I get the question of "what company are you with?""

"It’s about 80/20 for me. 80% of the time I still have to go to the front desk. I’ve asked the front desk folks, and they always say “our property has a policy to not allow mobile check-in”… I guess Marriott allows this at the property’s discretion. One property said they don’t want the guest to get stuck with full charges if they end up having travel issues and mobile checked-in the day before."