United Airlines is trying to recruit pilots early in their training as the second-biggest U.S. carrier faces an impending shortage as half of its aviators approach retirement. The airline on Thursday said it would offer conditional job offers to candidates who apply to a special program as they build experience during their training and early-career experience at small airlines.

Close to half of United’s roughly 12,500 pilots will retire over the next 10 years, the airline estimates, and it expects to need to hire 10,000 over that period to keep pace with growth. Boeing has estimates that airlines will need 645,000 pilots from 2019 through 2038, with 212,000 in North America alone.

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