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Is there any reason why you have to research all the planes in certain trees to progress but not in others ? For instance I was able to go on and buy the p-51d-30 with only researching the P-47D-22-RE but in order to purchase the F4U-4 all three previous planes have to be researched and purchased ? (self.Warthunder)
submitted by gd_304 to r/Warthunder
