Search efforts continue for the missing Ontario-based air ambulance carrying six people, including four Canadians. Debris from the plane has been found, and the U.S. Coast Guard is involved in the extensive search operation. Crews are scouring a vast area off the U.S. coast, with the 'debris field' discovered in the search. The operation remains ongoing as authorities work to locate the missing aircraft. The search continues for the missing air ambulance. Remains of the aircraft have been found, and the U.S. Coast Guard is involved in the search. A wide area is being searched off the U.S. coast. Search efforts continue as the missing air ambulance remains unaccounted for. The Ontario-based air ambulance is still missing as search efforts continue. Debris from the plane has been discovered in the search area. Coast Guard personnel are assisting in the search for the missing air ambulance. The search area is vast off the U.S. coast. The operation remains ongoing as authorities work to locate the missing aircraft. Authorities are still searching for the missing air ambulance as the missing aircraft remains unaccounted for.