Link to Frequent Business Traveler article
The codeshare agreement includes AT flights between the United States and Casablanca, AA PHL-CMN beginning June 2020, onward service to RAK / Marrakech, and some domestic AA flights . “The agreement will expand to include several additional routes next year, including Royal Air Maroc flights to Abidjan, Côte d’Ivoire; Lagos, Nigeria; and Luanda, Angola.”
RAM will join one world in 2020.
Also see
Musings: Royal Air Maroc – time to change the xONEn continent definitions?