"IBM's Hilton codes (001368083 for International, 0901452 for US) follow the same pattern documented for IBM Marriott. FlyerTalk's definitive IBM hotel thread: "I've used IBM's corporate rate for 14 years at 80-100 nights annually and never once been asked for ID." However, "Newark Airport Marriott religiously asks for ID, requiring a letter from IBM." London Hilton properties have been systematically checking ID since 2022 per documented "London Hiltons requesting corporate ID" thread. IBM is one of the largest corporate travel account holders at Hilton globally."

"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."

"I have used heavily discounted corporate rates for many years all over London, and have not yet been asked for ID. If I was, all I could do would be to send an email from my work account which at least is clearly from the associated company."