The attributes of fifth-generation that really stand out are very low observable stealth, advanced sensors, the fusion of that sensor information both from on board the aircraft and off board, and the networking that allows that process to take place. The combination of all of these attributes allows fifth-generation capability to far exceed any other option that we considered, any fourth-generation, or four-plus, type of aircraft.
On September 15th, 2010. See this statement in context.