As people return to the skies, we are asking for everyone's help in complying with flight attendant requests to help ensure a safe and fun atmosphere for all," said a statement from Lyn Montgomery, presdient of Transport Workers Union of America Local 556. Montgomery said in an open letter to Chief Executive Officer and Chairman Gary Kelly that 477 passenger misconduct incidents happened on Southwest Airlines aircraft from April 8-May 15. "This unprecedented number of incidents has reached an intolerable level, with passenger non-compliance events also becoming more aggressive in nature," Montgomery wrote. Southwest Airlines spokesman Chris Mainz said the carrier does not "condone or tolerate verbal or physical abuse of our flight crews." On Sunday, a Southwest passenger was arrested on suspicion of felony battery causing serious injury after she allegedly struck a flight attendant during a flight from Sacramento to San Diego, according to a statement from the Port of San Diego Harbor Police Department.