"JOH is listed on FlyerTalk's "List of publicly usable Marriott reservation codes" as one of the widely-circulated three-letter ticker codes. A self-identified J&J employee was cautioned: "the code is not meant to be shared publicly — the proper way to get it is to email someone from your company." hotelcorporatecodes.com lists JOH at 10-15% discount with "⚠️ Sometimes" verification. FlyerTalk general pattern: pharma/healthcare corporate codes at full-service Marriott yield ~30% chance of check at urban US properties, near-certain in Europe/Asia, essentially zero at select-service. The code's ticker-symbol obviousness means it circulates widely, which has historically triggered audit flags at some properties."

"My employer does not have a corporate rate but when I'm consulting for a company that does, I use theirs. I've only been challenged for identification once. In that one situation I explained the consulting arrangement, and the desk clerk accepted it without a badge or business card (neither of which I had anyway)."

"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."