But it's not every couple of years, is it? The patch for the current widespread problem was released just a couple of months ago, and there have been more security patches for other things since then.
Also, those $100m devices aren't in service 24/7/365. No-one takes an airplane out of service in mid-flight to apply a security update.
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.
Also, those $100m devices aren't in service 24/7/365. No-one takes an airplane out of service in mid-flight to apply a security update.