United Airlines is asking its pilots to take time off in May because the airline isn't getting as many new planes from Boeing as it expected. A United spokesperson said Monday that the request is voluntary. Manufacturing problems at Boeing are under investigation by federal regulators. The aircraft company's deliveries are suffering, and the launch of a new, larger 737 Max model has been delayed. United expected to begin getting those Max 10 jetliners this year. Now the airline is considering options to replace them. United CEO Scott Kirby is one of several airline CEOs who called out production problems at Boeing.
