Sorry, the two years was a reference to Windows XP, of which there were also way too many installs still around (although possibly not on critical devices, but all the more irresponsible to not have upgraded them, then).

> No-one takes an airplane out of service in mid-flight to apply a security update.

No, not mid-air, but close to: https://en.wikipedia.org/wiki/Emergency_airworthiness_direct...