"Citigroup's Marriott code CIT is one of the most widely circulated financial sector codes. FlyerTalk users report: "Citigroup code has been posted on public sites for 10+ years — it's one of the most-shared codes in the community." hotelcorporatecodes.com lists CIT with "⚠️ Sometimes" verification. NYC-area full-service Marriotts (near Citigroup HQ in Tribeca/Park Avenue) are more likely to verify. US domestic outside NYC: 5-15% check rate. Europe/Asia: meaningfully higher. Business card typically resolves verification requests."

"I mean, it depends on the size of the hotel. Having one person on night shift for a Fairfield isn’t uncommon. The better hotels have more people working at front desk even at night simply due to the size and brand. I’d however say though, if the property has been notified of the guest’s check in time in advance, and part of deal of getting into night shift is to check people in at unusual hours like that, then it certainly does not sound right to me that the front desk agent cannot have the meal earlier or later out of that many hours of the shift."

"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."