"Sixt's Hilton code D343260360 is for the German car rental company. Car rental corporate codes at hotels present an unusual dynamic — Sixt is a corporate account as a travel partner, not an employer benefit for its own staff. No FlyerTalk thread discusses Sixt Hilton employee verification. Car rental company codes are low-enforcement at all hotel brands: hotels see Sixt as a booking channel partner, not a confidential employee benefit program."

"FlyerTalk's dedicated Hilton FedEx thread provides community data: "Hilton is hit or miss about checking for special codes. I have used several codes, all real, and have been asked maybe 20% of the time to show proof." Another user: "I honestly can't remember the last time I made a reservation without some kind of corp code. I have never once been asked to show any sort of ID." FedEx reportedly monitors Hilton usage volume, which could affect contract renewal terms. HotelCorporateCodes.com rates this as "Sometimes.""

"Ford (alt) Hilton code N0900266 appears to be a secondary Ford Motor Company code. Ford's primary Hilton code is rated Low — no documented verification incidents outside Detroit-area properties. Ford has major HQ in Dearborn MI; Hilton properties in that market are familiar with Ford employees but the general US-wide enforcement rate is very low (~10-20% Hilton average). Secondary codes circulate less widely and face even less scrutiny than primary corporate codes."