The search continues for two Alberta men missing since last Thursday in the Wawa, Ont., area after the plane carrying them vanished.
The aircraft carrying John Fehr and Brian Slingerland disappeared on Thursday evening en route to Marathon.
The pair were in the Piper Comanche plane purchased by Slingerland from the township of Delhi in southern Ontario.
To concentrate search-and-rescue resources in looking for the plane, the Joint Rescue Coordination Centre [JRCC] has established an Air Task Force at the Sault Ste. Marie airport.
Maj. Trevor Reid, public affairs officer with JRCC in Trenton, said recent weather conditions have made the search difficult.
"Certainly weather has been a factor for us," Reid said. "Additionally, the terrain that we are searching over is very challenging. It's up to five feet of snow in some parts, it's hilly, [with] trees."
As the skies clear and weather improves, Reid said more aircraft are joining the search, including a RCAF CC-138 Hercules, a CH-149 Cormorant and a Bell 429 helicopter from the Canadian Coast Guard.
"Obviously our folks are doing the best they can in difficult circumstances," Reid said.
Sister of plane occupant asks for help
In a Facebook post Tuesday morning, Mary Reimer, Fehr's sister, implored friends to report any sightings of her brother's plane.
"The two pilots are still missing and we need help finding them," the post reads. " If anyone lives up in Wawa and Sault St Marie area please notify the search team if you saw an airplane on the evening of the 14th."
Reid added that the public should contact the search headquarters at (613) 966-1178 if they saw a small aircraft along Highway 17 between Sault Ste Marie and Wawa on Thursday, April 14, around 6 p.m. ET.