Lawyers for 26 passengers said Friday they told Lufthansa that they will sue the German airline for refusing to let members of a large group of Orthodox Jewish passengers board a plane after some had refused to wear masks on an earlier flight. The lawyers from the American Center for Law & Justice, a conservative advocacy group based in Washington, D.C., said in a letter dated Thursday to Lufthansa’s CEO that the passengers were victims of an “unconscionable antisemitic incident” on May 4 in Frankfurt. The lawyers said they will detail the passengers’ “legal claims and demands” against Lufthansa next...