Wirelessly posted (BlackBerry8530/5.0.0.601 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
"CDG -> ORD/DTW (stop) -> HNL/LIH"
CDG-ORD (stop) - Hawaii would work, but CDG-DTW (stop) - Hawaii would not. The free stopover can only be at the North American "gateway." Since neither AA nor its partners offers a direct flight from Europe to DTW, DTW cannot be a gateway.