Warner Bros. story editor Irene Diamond convinced producer Hal B. Wallis to purchase the film rights to the play in January 1942. Brothers Julius and Philip G. Epstein were initially assigned to write the script. However, despite studio resistance, they left to work on Frank Capra 's Why We Fight series early in 1942. Howard Koch was assigned to the screenplay until the Epsteins returned a month later. Principal photography began on May 25, 1942, ending on August 3; the film was shot entirely at Warner Bros. Studios in Burbank, California with the exception of one sequence at Van Nuys Airport in Van Nuys, Los Angeles.
where was the airport scene in casablanca filmed
at Van Nuys Airport in Van Nuys, Los Angeles