The production suffered an abrupt medical crisis before filming had fully settled into routine. On Christmas Day in 1968, writer-director George Seaton contracted pneumonia and had to step away while recovering. Universal brought in veteran director Henry Hathaway to keep the expensive production moving, and Hathaway reportedly directed most of the exterior material during Seaton's absence. Despite working on the film for approximately five weeks, Hathaway accepted neither payment nor screen credit. The arrangement was an unusually self-effacing solution to a potentially disastrous interruption: Airport depended on large-scale airport operations, winter exteriors, aircraft work, and a costly ensemble cast, so a prolonged shutdown could have severely damaged the schedule and budget. Seaton eventually returned and remained the credited director, while Hathaway's invisible contribution became one of the production's stranger behind-the-scenes stories.
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