Rule of fame No. 634: No public spat goes unnoticed. CNN correspondent Jim Acosta was on a Delta flight from Des Moines to Reagan Wednesday when a flight attendant made the standard pre-landing announcement: Buckle up, stay out of the front lavatory. Acosta, who happened to be in that bathroom at the time, felt she deliberately singled him out and confronted her in front of other passengers — calling her rude and asking for her name. Bad idea because a) he’s a recognizable TV guy and b) flight attendants always win. “It was an unfortunate situation, and the flight attendant apologized to me,” Acosta told us Thursday.