"hotelcorporatecodes.com lists MCD (McDonald's) explicitly with verification status "✅ Rarely" — the lowest verification designation. Regional scope is North America. McDonald's corporate travel tends to concentrate in suburban/airport corridors near Oak Brook IL HQ and regional offices — property types (Courtyard, Residence Inn, Marriott) in these corridors have the lowest enforcement rates on FlyerTalk. No specific FlyerTalk thread found discussing MCD code challenges. The "Rarely" rating aligns with the general pattern that non-financial, non-consulting consumer-brand codes at non-luxury US properties face minimal scrutiny."

"GAP Inc's Marriott code GAP is listed in corporate code databases. No verification incidents documented in FlyerTalk or Reddit discussions. Clothing retail corporate codes at Marriott receive minimal attention from front desk staff — retail employee IDs are not standardized enough to be reliably verified. US domestic properties rarely verify retail-sector codes."

"Deutsche Bahn's Marriott code 11353 is a German railway operator code in the global GDS system. Outside Germany, this code is essentially unknown to hotel front desk staff. German Marriott properties near Deutsche Bahn offices may be more familiar, but the code is rarely discussed in English-language travel forums. No verification incidents found. European public transit company codes attract minimal scrutiny."