extremely complex software such as what the F-35 runs on, is all C++
http://spectrum.ieee.org/riskfactor/aerospace/aviation/softw...
Note well, though, that the coding standards strictly limit the C++ features you can use. It's not done the way your average bunch of C++ code cowboys sling out an application.
F-35 is a similar example (worse because the contractor was probably at fault here: using C++ made the software system go way over budget on a cost-plus contract, and will likely result in larger maintenance contracts down the road. That's a win-win as far as the contractor is concerned...)