The thousands of flight cancellations that have brought global passenger travel to a near standstill are making it tougher and more expensive to send fresh food, mail and merchandise around the world.
Before the coronavirus pandemic, more than half of all air cargo traveled on passenger flights, according to data from the International Air Transport Association. Fliers essentially subsidized the cost of many air shipments, and carriers devoted roughly a third of their cargo space to letters, packages and commercial goods,…

