 Pan Am was forced to file for bankruptcy protection on January 8, 1991.Delta Air Lines purchased the remaining profitable assets of Pan Am, including its remaining European routes (except one from Miami to Paris), and Frankfurt mini hub, the Shuttle operation, 45 jets, and the Pan Am Worldport at John F. Kennedy Airport, for $416 million.Delta also injected $100 million becoming a 45 percent owner of a reorganized but smaller Pan Am serving the Caribbean, Central and South America from a main hub in Miami.