safety

Our flight was delayed for over an hour due some check light going off during the pre-flight checks. And it wasn't even anything vital, just some trivial secondary system.

Sure, it was annoying just waiting there on a runaway while the technicians went through the systems trying to figure out what was wrong. But on the other hand it was assuring. It's a good thing all those security protocols are being followed and the plane won't leave the ground even if there is only one minor error light turning on.