A long-lost audio tape of radio communications between White House officials just hours after the assassination of President John F. Kennedy sheds light on the way top government officials reacted to a national catastrophe. "Many things had to be arranged in that 4 1/2 hour flight," said history professor emeritus James Hilty of Temple. "It was the equivalent of what would take place after a presidential election between November and January when a new president would come in. President Johnson had to put his whole operation in place during the flight back from Texas."