F-35 fighter jets are running so many different versions of their core software that a US government watchdog has warned of knock-on delays to flight tests. Core software aboard the Mach 1.6 stealth jet is in such a state of disarray – with aircraft at different US military bases running different versions of it – that the US Department of Operational Test and Evaluation (DOTE) said planned future releases were being stripped of new features so developers could address the thousands of bug reports filed by pilots and engineers.

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