Originally Posted by
hpmh
They have computer programs that do all the calculations. Airlines use standard weights for people (which, fun fact, are higher in the winter). It's not like being a few pounds over will automatically make a plane fall out of the sky, there's obviously a margin for safety also, so it's usually just about getting a ballpark weight.
And sometimes - very rarely - the software is wrong.
https://mentourpilot.com/how-alaska-...-tail-strikes/