"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."

"Bank One's Marriott code BOB may still exist in Marriott's GDS system following the 2004 acquisition by JPMorgan Chase. JPMorgan has a separate Marriott code (JPM). Legacy acquired-company codes are practically never verified as the hotel has no way to confirm employer identity for a company that no longer exists independently. Risk for legacy codes is negligible."

"I've never been asked, but last night I stayed at a SHS I had only stayed at once before and the clerk casually asked "what company are you with" and she was writing out my card. I suspect she was comparing to the rate plan I used for the reservation."