"hotelcorporatecodes.com places Fiat Chrysler (now Stellantis) in the "Sometimes" verification tier. A live booking test confirmed the code resolves to approximately 7% savings. The code's rebrand from FCA to Stellantis means two overlapping codes circulate publicly, slightly elevating hotel-side suspicion. FlyerTalk's general Hilton thread notes that automotive OEM corporate codes are moderately checked in Detroit-area properties where staff know the company well enough to ask."

"One thing I am curious about is whether the hotel CRM shows the booking channel. Most true corporate travel is booked through something like Concur, AMEX GBT, CWT, etc. If the agent sees the booking come through one of those channels with a person's name on it and then gets a card or photo ID (not corporate ID) from said person, it's a pretty low fraud risk. But if it is a reservation through the hotel's channels using just a typed-in code, then I'd think they would have reason to be more strict in seeking proof of affiliation."

"I know that previously the Hertz IBM rate was always fixed in the mid $30s for a full size vehicle with last car availability. A minivan was $175/week in Orlando even during President's week when the going rate was about $1,200. This is probably why Hertz and at least Avis has been more strict. I have found Marriott to be very strict, especially at key locations, when it comes to the government rate. Marriott wants travel orders, a government ID, and/or a government credit card. I found Hilton to be less strict for those government rates."