AntonS -
My favorite was PHL-EWR-LHR-RAK/CMN-CAI-AMM-JFK/LGA-PHL
PHL-EWR-LHR on US operated by CO, LHR-RAK BA, CMN-CAI AT, CAI-AMM MS, AMM-JFK US operated by RJ, LGA-PHL on US. Fared as PHL-RAK/AMM-PHL as a US fare and CMN-CAI-AMM on a AT fare; all on the same ticket. And it was dirt cheap because the US Airways fare desk computed the taxes incorrectly.