(The Center Square) — The federal government is sending more than $6.1 million in taxpayer money to four South Carolina airports as part of grants for rehabilitation and construction projects. The latest in federal tax money is from the 2024 Airport Improvement Program’s third round of grants. The latest tranche of funding includes more than $374 million the Federal Aviation Administration announced for airfield and safety projects at 299 airports in 46 states and American Samoa. The largest award announced for South Carolina airports goes to Greenville-Spartanburg International Airport in Gre…