The ban on Boeing's 737 Max 8 planes stem from safety concerns over possible parallels between two deadly jetliner crashes involving the same type of aircraft. Here are facts and figures about the Max 8 ban and how it affects Canadian passengers and airlines. Passengers affected daily: About 12,000. Air Canada operates 24 Max 8s, with Westjet operating 13 and Sunwing operating four. WestJet cancelled 11 flights on Thursday, affecting 1,400 passengers, three-quarters of whom were rebooked on flights that day. The remainder are schedule to depart Friday or Saturday. Potential cost of Max 8 ban for Air Canada and WestJet: At least $100 million in the first 10 days. More than 40 countries have grounded or banned the Max 8 from their airspace. More than 375 Max 8s have been grounded around the world.