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You can stream Q Planes (1939) on Criterion Channel with a subscription.

In England, an eccentric police inspector, an earnest test pilot and a spunky female reporter team up to solve the mystery of a series of test aircraft which have disappeared without a trace while over the ocean on their maiden flights; unaware, as they are, that a spy ring has been shooting the planes down with a ray machine hidden aboard a salvage vessel which is on hand to haul the downed aircraft aboard, crews and all.

A sharp-witted reporter and a steady test pilot collide with a high-tech conspiracy involving vanishing aircraft and mysterious rays. Laurence Olivier brings a magnetic intensity to this pre-war mystery where the skies hide a deadly secret.

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