399830 01: F. Andy Messing Jr. Checks In At An Airline Counter With His Pet "Dick The Dog" For A Flight To St. Petersburg, Florida January 18, 2002 At Washington Dc's Reagan National Airport. A New Law Went Into Effect January 18 Requiring Airlines To Check For Explosives, Either By Machine, Hand Or Bomb-Sniffing Dog Or By Matching Each Piece Of Luggage To A Passenger On Board.  (Photo By Manny Ceneta/Getty Images)