United Airlines will pause pilot hiring this spring because of Boeing delivery delays, the latest effect of the plane maker's problems on one of its biggest customers. New hire classes will be paused in May and June and will likely resume in July, Marc Champion, vice president of flight operations, and Kirk Limacher, vice president of flight ops planning and development, told staff Thursday in a memo, which was seen by CNBC. "We wanted to let you know that United will slow the pace of pilot hires this year due to continued new aircraft certification and manufacturing delays at Boeing," they wrote. Bolts appeared to be missing on the plane when it left Boeing's factory, a preliminary investigation found. United's CEO, Scott Kirby, in January said the carrier is making a fleet plan without the Max 10.

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Persons: Marc Champion, Kirk Limacher, Boeing Max, Bolts, Max, Scott Kirby, Limacher Organizations: Boeing, CNBC, Alaska Airlines, Federal Aviation Administration