Air Canada and WestJet will start sitting passengers next to each and loading planes to the maximum following decisions by US airlines to do the same. The airline industry has been savaged by COVID-19 shutdowns and passenger fear of close contact with strangers. Both airlines had blocked the sale of adjacent seats in economy class. But the carriers said Friday that starting July 1 they will revert to health recommendations from the United Nation’s aviation agency and the International International Air Transport Association (IATA) trade group.