The crisis that has embroiled the world’s airlines is now hitting the industry’s biggest aircraft makers, Boeing Co. and Airbus SE, and further challenging Boeing’s efforts to return its 737 MAX to service.

Airbus said it was slashing production by about a third after booking just 21 net orders for jets in March and delivering 36 jets to customers, amid a flood of requests by customers to defer and cancel orders.

Underscoring…

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