“Humanoid and animal-like robots” now rank as machina non grata at United Airlines. “We no longer allow humanoid and animal-like robots in the cabin or as checked baggage,” spokesman Charles Hobart said in an email. Smaller robots may still fly; the new policy mentions “small toys and gadgets” if they meet United’s other safety rules. Southwest Airlines, which has also been more aggressive than its competitors in restricting power banks, added its own ban on “human-like” and “animal-like” robots in May. Editors' Note: We updated this post to add information about Delta's robot ban.