And the different levels therein can help you think about your own systems, even if someone won’t crash a plane if your software fails.

A large passenger aircraft does not solely consist of Level A software. There’s plenty of not-flight-safety-critical software on any airplane you ride as a civilian passenger, but there is some Level A software that could cause the worst consequences if it fails.

Think about what pieces of your software are critical to your company/team’s mission, and which aren’t so bad if they fail. Not every line of code you write, or system you build, will wreak havoc on your company’s primary mission.