Not just in aviation, either.
My son is in IT and was lured there on a good contract with promise of renewal. Come renewal time, they said there was no option for renewal.
He shows them his contract (in English) and they say that it is a mis-translation, his arabic contract holds no such provision. He tells them that THEY had provided the english version, their response was "Oh, no, we wouldn't make a mistake like that. Bye bye!"