American Airlines asked the federal government on Wednesday to stop using its commercial planes for “transporting children who have been separated from their families due to the current immigration policy.” The announcement, which was posted on American’s website, is the latest fallout from the Trump administration’s decision to separate parents who have arrived at the southern border illegally from their children. Several flight attendants for American, the world’s largest airline, have posted testimony on public and private social media channels in recent days, describing how they have seen groups of unaccompanied Latino children on domestic flights, accompanied not by parents...