Page "United States Air Forces in Europe" Paragraph 245
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Casey Jones flights were made by RB-24 Liberators and RB-17 Flying Fortresses converted for photographic use.
These flights were only supposed to be flown over the Western Allies occupation zones, but there is a strong suspicion that these aircraft also operated over the Soviet zone.
As was likely, Soviet fighters regularly opened fire on American aircraft operating over their occupation zone.
On April 22, 1946, an American C-47 near the Tulln Air Base near Vienna over the Soviet zone of Austria was attacked by Soviet Bell P-39 Airacobra fighters.
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