Helen Reddy’s role as Sister Ruth, a singing nun in Airport 1975 (1974), became an unexpected legal complication for the makers of Airplane! The Zucker, Abrahams and Zucker comedy originally intended to cast Reddy in a similar nun character, clearly echoing the disaster-film convention established by her Airport 1975 appearance. Universal Pictures, which owned Airport 1975, was reportedly positioned to pursue a copyright-infringement lawsuit if the resemblance was too direct. To avoid that threat, the filmmakers replaced Reddy with Maureen McGovern and altered the film’s international title to Flying High. The episode illustrates how a studio’s control over a recognizable character concept—and the fear of expensive litigation—could shape casting and even the marketing identity of a rival production. Airplane! ultimately turned the entire Airport cycle into one of its primary targets, transforming the solemn disaster-film formula, including its improbable celebrity passengers and inspirational musical interludes, into broad parody.
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