"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 think the generic 'show corp id' designation means show the company business card. I think a lot of us don't have them or, if we do & we're not going to an office that we'd need to show them, leave them at home. I worked for some F500s that didn't require corp ids with shiny smiling faces on them & others that did; same with company credit cards. All, however, provided biz cards when working for them."

"I occasionally try to get the corporate rate for a company I'm visiting in the area (for sales/consulting). Only once has a front desk clerk asked me to prove my eligibility, and she was satisfied by me giving the name and telephone number of the person I was visiting."