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. Search efforts remain ongoing for the missing air ambulance. Debris from the plane have been found, and the U.S. Coast Guard is involved in the search. The search area is vast off the U.S. coast. Authorities are still working to find the missing aircraft as the missing air ambulance remains unaccounted for. The Ontario-based air ambulance is still missing as search efforts continue. Remains of the aircraft have been found in the search area. The Coast Guard is helping with the search for the missing air ambulance. A wide area is being searched 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.