Earlier, Canada's transport minister said Wednesday that satellite-tracking data indicated "a possible, although unproven, similarity" between the Ethiopian Airlines jet that crashed last weekend and an October crash involving the same type of Boeing Co. 737 MAX aircraft, the first time a regulator has cited data suggesting a potential link between the problems that doomed the two jetliners. The pilot of the Ethiopian Airlines jet that crashed Sunday reported that he was having flight-control problems and wanted to return to the airport, but didn't indicate any other technical faults or other difficulties during the jet's short ascent, according to the carrier's chief executive. The general similarities between the two crashes—both involved brand new MAX 8s that went down shortly after takeoff—have prompted increased scrutiny of the jet. Mr. Gebremariam, the Ethiopian Airlines CEO, said those black boxes would be sent to Europe for analysis, although a final determination as to which country hasn't been made.