A man is under arrest after opening a plane's emergency door last night at Newark Liberty Airport. Troy Fattun of Micronesia, a passenger on United Flight 1640 to Tampa last night, panicked when he realized he was on the wrong flight and said, "Wait, where are going? Why am I on this flight?" Police arrested Fattun after he coasted down an inflatable slide. The flight was delayed for five hours while United switched passengers to another plane which finally got to Florida at about three o'clock this morning.