All six passengers presumed dead after plane went missing off US coast

"This is an unimaginable loss for our Latitude family and for everyone who loved the six people aboard Heartbeat 104," said Peter Byl, President of Latitude Air Ambulance, on Sunday evening. "Our focus now is on supporting their families, supporting our people and assisting the authorities. We will honour our colleagues by remembering the care, professionalism, and commitment they brought to their work every day."Latitude Air Ambulance is a Canadian company that provides international medical flights for patients returning home.Two pilots and two medical staff, both Canadian, had flown to Bermuda to collect a patient and their relative, Clarence Togeretz, director of flight operations at Latitude, told CBC News. FlightAware's tracker shows that the aircraft significantly dropped in altitude before its communications went dark, plummeting from around 7,300m (24,000ft) to 3,300m (11,000ft).Radio transmissions show trouble with communications between the air traffic controller and the pilot, the Boston Globe reported, based on transmissions provided by LiveATC.net. "You're coming in blind? Is that what you said?" the air traffic controller asked. "Are you declaring an emergency, or no?"The pilot's response was inaudible.