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A traveller (L) checks in at the WestJet check-in counter of Pearson International Airport in Toronto, Canada, March 24, 2020. Canada's second largest airline WestJet on Tuesday announced to lay off 6,900 employees due to the impact of the COVID-19 pandemic. Nearly two-thirds of the airline's fleet of 120 aircrafts are currently grounded. (Photo by Zou Zheng/Xinhua)