Unit costs for the F/A-18 E/F program have not grown since the critical design review and its schedule has been delayed by only 3 months.
Unit costs have ballooned since the critical design review. 
mnli hypothesis: Unit costs have ballooned since the critical design review.  premise: Unit costs for the F/A-18 E/F program have not grown since the critical design review and its schedule has been delayed by only 3 months.