S.C. Code Ann. § 55-9-235: Alcohol sales at airports.

(A) During the hours of airport operation, any business establishment or concessionaire operating in the Transportation Security Administration-screened portion of Charleston International Airport, Columbia Metropolitan Airport, Florence Regional Airport, Greenville-Spartanburg Airport, Hilton Head Island Airport, or Myrtle Beach International Airport may, upon the written approval of the respective airport authority, sell alcoholic liquor by the drink to a person twenty-one years of age or older for consumption throughout the Transportation Security Administration-screened portion of the establishment's or concessionaire's respective airport terminal, provided that the establishment or concessionaire is licensed in South Carolina to sell alcoholic liquor by the drink for on-premise consumption.

(B) A person twenty-one years of age or older may purchase and consume alcoholic liquor by the drink throughout the interior of the Transportation Security Administration-screened portion of the respective airport terminal, provided that the purchase is from an approved business establishment or concessionaire licensed in South Carolina to sell alcoholic liquor by the drink for on-premise consumption.