"Boeing's Radisson code (20494) is a secondary Boeing code alongside the Marriott code (BWG rated Medium). Radisson's franchise network applies far less consistent enforcement than Marriott. Boeing's major travel markets (Seattle, Chicago, Charleston SC, St. Louis) are primarily Marriott/Hilton-dominated, making the Radisson code a lower-frequency option. Radisson's Americas properties (now Choice Hotels) have minimal verification infrastructure."
— FlyerTalk; Radisson general pattern
"Last year December, two stays. Radisson ARN Skyline. No form was asked. Code RHGRFNF still works, checked a week ago."
— Jaenks