"Pfizer holds two Marriott corporate codes (4899 and PFZ), reflecting the company's size and travel volume. FlyerTalk's Marriott ID thread notes: "In the US and Canada, never asked to show a work badge. Overseas — they tend to follow the rule by the book." One key risk factor: Pfizer's dual-code structure suggests a formally managed travel program. Corporate contracts sometimes include provision for hotels to share guest lists with the company — unauthorized users could be flagged to Pfizer's travel desk."

"I have a close friend who is a GM at a Marriott property in a fairly large US city (top 25 metro population). Their opinion is basically, "Hey, it's business. I'm not turning away a paying guest if they don't have the right ID." In this person's younger days as a front desk agent, they enjoyed catching people trying to use a corporate rate that the guest was not entitled to. As they became higher up and saw the books, occupancy rates, etc... Corp ID's became far less important than filling rooms."

"I have been asked to show some proof couple of times. I normally show my corp id but credit card with employers name on it has worked, too. As would probably just showing my laptop with employer e-mail account or whatever. My impression has been they are happy with just about anything that proves I'm working for the company whose rate I use and why wouldn't they."