The Allies didn’t have “a” plan to wage the Battle of the Atlantic, and neither did the Germans. The Battle of the Atlantic was a complex battle of attrition on a gigantic scale which lasted all the way from September 1939 to May 1945, and it was characterized by constant changes of plans and tactics and weaponry on both sides as it progressed, with each side trying to overcome every new enemy development with a suitable counter-development. The campaign see-sawed several times, with one side or the other gaining the advantage at various points; some methods of waging the campaign became ineffectual as time progressed, but were highly effective in earlier stages and therefore were entirely correct to use at those points.
Harrison Ford just crashed a WWII Ryan PT-22 Recruit
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http://www.cnn.com/2015/03/05/entertainment/harrison-ford-plane-crash/index.html
Hope HF will be alright.
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It looked like a PT-6. They must be pretty similar.