United Airlines said passengers who refuse to wear masks on flights can be banned from traveling with them. According to Business Insider, the policy will take effect starting June 18. While other airlines have also required masks, many of them have come under criticism for failing to enforce it. In response, airlines said it would improve through pre-flight communications, on-board announcement and consequences for noncompliance. United’s chief customer officer said masks can be effective to protect each other from getting COVID-19.