Air Canada and WestJet both announced they will begin selling the middle seats on their aircrafts again as Canada slowly reopens amid the novel coronavirus pandemic, but experts caution that crowded cabins are risky and could lead to further outbreaks.As of July 1, both airlines will have their middle seats available for sale.The moves come after the International Air Transport Association (IATA) released a report earlier this month, calling for an end to physical distancing measures aboard aircraft.However, Colin Furness, an infection control epidemiologist and assistant professor at the University of Toronto, said he was “appalled” to learn that airlines have decided to return to selling middle seats, saying that this should “absolutely.