June 26 (UPI) -- The Transportation Security Administration on Friday said that it expects to screen roughly 18.7 million travelers at U.S. airports during the July Fourth holiday week that runs from June 30 to July 6. The agency said it has prepared itself for the traditionally busy week of travel to be even busier, as this July 4 is America's 250th birthday amid the FIFA World Cup, which has games in 11 U.S. cities next week. AAA has projected that this year's week of holiday travel is set to