People were also saying that the ATC operator may not have been a native English speaker which could have led to communication issues.
IACO rules require that all "International" Airports have at least one French speaking and one English speaking controller on duty during all hours of operation. Air France pilots prefer to communicate with Logan in English. Quebecair insist on using la langue française.
I worked with a Haitian engineer (good guy, ambitious, hard working) at Raytheon. We did a lot of testing with the Army, where we communicated with the Army personnel (civilians I believe) over radio, he took a lot of shifts on headset. (Only one member of our crew spoke during a mission. We took turns.) He had a distinct Haitian accent, but I never noticed any deficiencies. Last I heard he was actually working at a contractor (Raytheon) maintained site in Japan with his Haitian bride. I don’t know what the Japanese make of him.
ONLY ONE ATC on duty.
MINIMUM IS 2.