(Undated)  --  Experts are dismissing a warning by GOP presidential candidate Donald Trump that Boeing's South Carolina plant could shut down because "it will be cheaper to build in China."  Richard Aboulafia, with D.C.-area consulting firm The Teal Group, told the "Seattle Times" that there's a trend toward moving jobs back to the U.S., and says Trump appears to be "badly confused" about the airplane industry.  Adam Pilarski, with aviation consultant Avitas, calls Trump's claim "ridiculous."  Trump made the remarks while campaigning last week in South Carolina.