Sounds like poor error handing. 0 is valid value is not a substitute for no data or error.

Not according to the article, the values returned were within the realm of possibility, but wrong. Giving out zeroes might have actually been fine, it’s easy enough to realise there’s a problem if you see your plane weighs 0 pounds.

Hence “some part of a value.”

Such as weight=plane+fuel+people+luggage. If one of the variables became 0 you’d still have the other 3.

It was a low enough value to have made multiple pilots question its value that day, like fuel or passenger load was missing completely.

I mean it might be just one part. E.g. luggage gets counted as zero but passenger weight, fuel weight and aircraft weight correct - that might be pluausible but low.

Classic pokemon exception handling.