Canadian citizens wait to board a Montreal-bound plane in Port-au-Prince on Tuesday. (CBC)

A plane carrying about 130 Canadian citizens who were stuck in Haiti was on its way to Montreal on Tuesday night.

The plane, which left Toronto's Pearson International Airport for Haiti early Tuesday, was due to arrive at Montreal's Pierre Elliott Trudeau airport at about 10 p.m. ET.

After the aircraft landed in the capital Port-Au-Prince at around 1:30 p.m., the 12-person crew unloaded about 12,000 pounds of emergency medical supplies and water purification equipment desperately needed in the wake of the devastating earthquake last Tuesday.

Aircraft carrier Westjet donated the use of the plane to the aid organization World Vision, which organized the trip.

"It's wonderful to be getting these relief supplies because pharmaceuticals and water purification equipment are really important," said Dave Toycen, president of World Vision.

"Every hospital that I'm aware of, every clinic is short of the essentials here. So [these kinds] of emergency supplies [are] really critical."

About two hours after it landed, the plane left for Miami to refuel, then departed for Montreal at about 7 p.m. ET.

The supplies have now reached distribution centres, and World Vision said those who need the aid will get it within 24 hours.

Relief workers say violence is hampering the already slow delivery of aid. Some locals have begun forming night brigades and machete-armed mobs to fight bandits across Port-au-Prince.

According to the latest estimates put forward by the European Commission, more than 200,000 were killed in the temblor, while about 250,000 people were injured and 1.5 million were left homeless.

The government in Ottawa, meanwhile, has reported that 665 Canadians are still unaccounted for, down from 699 on Monday. The number located and accounted for has risen to 1,641 from Monday's 1,433.

So far, 1,206 Canadians have been evacuated from Haiti back to Canada.