thus making the F-35/JSF program the costliest Pentagon weapons program ever, at an estimated $113 million per aircraft with over 2,400 of them desired by the services.
http://www.cnn.com/2010/POLITICS/03/12/pentagon.f35/index.html?hpt=T2
The F-35 program cost overrun triggered the Nunn-McCurdy law, which requires the Pentagon to tell Congress of significant cost increases. The law forces the Pentagon to justify continuing with the program.
The Pentagon's director of cost assessment and program evaluation, Christine Fox, told the senators she expects the Pentagon will officially notify Congress under the Nunn-McCurdy regulation by April 1.
http://www.cnn.com/2010/POLITICS/03/12/pentagon.f35/index.html?hpt=T2