This was already posted and discussed here 5 days ago!<p><a href="https://news.ycombinator.com/item?id=10538037" rel="nofollow">https://news.ycombinator.com/item?id=10538037</a>
Vanity Fear: Mexicans and El Salvadorans may be turning wrenches on your airplane<p><a href="https://news.ycombinator.com/item?id=10570702" rel="nofollow">https://news.ycombinator.com/item?id=10570702</a>
Sounds to me like "dey took er jerbs" fear mongering. Anecdotes without statistics are suspicious. US mechanics are hardly infallible. Show me the statistics about maintenance errors in the US vs elsewhere and we'll see.