I had an incident in the 1980s, in Dubai while on ACMI contract.
Flying a DC8-63F for Air India, where we ended to be grossly overweight.
The crewmembers were Americans, dealing with pounds...
They informed the agent with 35,000 "LBS" as "ok to load" on the aircraft.
We ended with some 35,000 "KG"...
No need to tell you how the takeoff/climb was...
I think I passed 10 feet above the lights of the end of the runway.
xxx
I would suggest you STRESS the importance of PROPER UNITS.
There are still idiots not educated with METRIC.
Happy contrails