Funny you mention the F-14.
At one point it was suggested that the programs that spawned the F-14 and F-15 should be rolled into one program. The idea being that the navy and the air force would share the development costs and end up with a cheaper plane. A study was done that looked at the feasibility of this, and the conclusion was that joining the programs would have to result in a larger and heavier aircraft to meet the navy and AF needs, as well as increased development time - all for a cost savings of an estimated 10% or so.
Funny how that study was forgotten.
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