Mask or no mask, FAA sticks to tough stance on unruly flyersViolent and unruly airline passengers will continue to face steep fines and potential criminal charges even as rules mandating face coverings fade away. The U.S. Federal Aviation Administration on Wednesday said its zero-tolerance policy against unruly passengers will be made permanent as it attempts to deter bad behavior. The move came two days after most major U.S. airlines eliminated policies requiring passengers to wear masks, an issue that has contributed to thousands of attacks on airline personnel since the FAA began its crackd…