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COOK: All right. Let me ask you about a couple other controversial programs, again, programs that members of Congress keep pushing for, you're pushing against. An alternative engine for this plane, does it make sense to build a second engine for this plane? You say no.
GATES: Well, we've done the business case, we've looked at it a number of times. It would be an additional cost of several billion dollars. It would start three to four years behind in terms of where we are with the F- 135 engine and there's no reason to believe that that prototype engine, or that that new engine would not encounter the same kinds of challenges and issues that other developmental engines on this aircraft as well as others have encountered in the past. At this point, based on the business case, we don't think it's necessary.