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In page Maureen Dunlop de Popp:

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At the outbreak of war, Dunlop decided actively to support the war effort. To join the Air Transport Auxiliary (ATA), women pilots needed a minimum of 500 hours' solo flying, twice that of a man. After sufficiently increasing her hours, in early 1942 Dunlop and her sister Joan travelled across the Atlantic Ocean on a neutral Argentine-registered ship.[citation needed]