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McDonnell Douglass tried to made a new model of the F-4 to replace the air force's old models, twice. the first time they tried, it actually was superior to the F-15 they were making, however, they canned it because they didnt have enough money at the time to put two mainline fighters into service at the same time and shelved it until they had the capacity to produce it. the second time they tried it they werent able to finish designing it before it was cut due to MD not having enough money to finish it, as this time around MD was in even an even worse position due to the commercial flop of the MD-11, and the loss of several contracts. the first one was going to be called the F-4 2000 (not to be confused with the kurnass 2000) and the second one never got a designation, due to being so incomplete.