On Me 262
But the main reason was problems with the jet engines, there were also problems with the airframe. And then Willy's maneuvers. A quick translation of my own text on the matter.
"Part of the reason was also the first partial revival of the Me 209 program, as early as June 4, 1943, then the complete revival on August 13, 1943. More Messerschmitt design personnel were committed to its development than to the development of the Me 262 from the beginning of April 1943 to the middle of July 1943, despite the RLM's decision on 25 May 1943 to remove the Me 209 from the production plans. Willy Messerschmitt had not accepted the halting of preparations to start production of the Me 209 and wanted it to go into production together with the Me 262, in effect as the main production aircraft. Using his Nazi connections, manipulating even Hitler himself, praising the Me 209 and warning against mass production of the Me 262, justifying his position with the fact that the Me 262's fuel consumption was much higher than that of the Me 209, not mentioning that the Me 262 did not use high-octane aviation gasoline as the Me 209 being able to use more readily available fuels, he managed to get Hitler to give an order in early August 1943 to return the Me 209 to production plans, where it remained until 13 January 1944 according to Smith and Creek, or until 26 November 1943, when according to Boehme Göring personally intervened matter, ending the program. The production plan updated on 15.8.1943 kept the Me 262 production more or less unchanged, the production was to exceed the monthly production of 100 machines in December 1944, the monthly production of 250 machines in February 1945, the production of 500 machines in May 1945 and reach the monthly production of 1,000 Me 262s in September 1945. The production of the Me 209 was supposed to start in July 1944, the monthly production of 100 machines would have been reached in February 1945, the production would have increased to more than 300 machines per month in May 1945 and to more than 500 in July 1945. But the construction of two production lines at the same time slowed down the completion of both and thus delayed the start of Me 262 production. Hitler had probably been informed of the decision to put the Me 262 into serial production at the end of May 1943. According to Milch, Hitler had opposed dropping piston engine fighters from production in favour of the Me 262."
Smith and Creek = Smith, J. Richard & Creek Eddie J. 1997: Me 262 Volume One. Classic Publications, Burgess Hill.
Boehme = Boehme, Manfred 1992: JG 7 The World's First Jet Fighter Unit 1944/1945. Schiffer Publishing, Atglen, PA.