Last Friday, Greenville-Spartanburg International Airport recorded its 4th busiest day this pandemic, aside from holiday travel surrounding Thanksgiving, Christmas, and New Year’s (Nov. 29, Dec. 27 and Jan. 3.), officials said.Air travel took a dip in January when cases spiked and people became more hesitant about flying, GSP officials said.GSP services more cities than it did before the pandemic, but it now has fewer flights.Experts