The Joint Rescue Coordination Centre (JRCC) in Victoria said they received a call on Thursday at 5 p.m. that an aircraft was missing.
Transportation Safety Board officials say the plane left a Lethbridge, AB training facility at 9:35 a.m. and stopped at the Cranbrook airport at 3 p.m. to refuel on June 8.
The plane then took off, headed for Kamloops but has not been seen since.
The JRCC crews, using a Cormorant helicopter and Buffalo aircraft, worked with local search and rescue in trying to the locate the plane. Crews searched on Thursday until nightfall and began again at first light Friday morning.
The Piper aircraft call letters are CGDTK.
Transport Canada’s airplane registry shows the plane is owned by Excel Flight Training in Lethbridge.
According to RCMP, the aircraft was piloted by Alex Simons, a 21-year-old and was accompanied by his girlfriend Sidney Robillard, 24.
The pilot’s brother, Jonathan Simons, told Global News the pair live in Lethbridge and were flying to Kamloops to visit. The 19-year-old lives there with their mother.
Jonathan said their father, Matthew Simons, was very involved with Alex becoming a pilot in the last year.
Search efforts are concentrated in a heavily treed, mountainous area between Cranbrook and Kamloops.
Jonathan said helicopters are surveying the flight path but were battling difficult weather.
Police are asking anyone with information about the missing plane and couple to contact their local police.