I decided to look up the Gimli Glider because I had never heard of it before. The "Gimli Glider" was the nickname of a Canadian aircraft. On July 23, 1983 the plane almost crashed because it ran out of fuel at an altitude of about 41,000 ft. It wasn't stocked with enough fuel before it took off because of a wrong measurement. It was miscalculated due to misunderstanding the metric system which was being adopted. Thankfully, the crew avoided a crash but disaster was almost unavoidable. This could've caused a huge problem for the both the plane company and the passengers on board at the time.
This could've been avoided in a few ways. One being that maybe the crew/whoever was fueling the plane could spend more time practicing conversion from imperial to metric before real life application begins. Practice makes perfect! Another way this might've been avoided could be that they have a few people who go back and measure again or run the conversions twice to check their work.