<Tr> <Td> American Eagle </Td> <Td> Akron / Canton, Albany, Allentown, Asheville, Atlanta, Augusta (GA), Austin, Baton Rouge, Birmingham (AL), Blountville / Tri-Cities, Burlington (VT), Cedar Rapids / Iowa City, Charleston (SC), Charleston (WV), Charlottesville, Chattanooga, Cincinnati, Cleveland, Columbia (SC), Columbus--Glenn, Dayton, Daytona Beach, Des Moines, Detroit, Evansville, Fayetteville / Bentonville, Fayetteville (NC), Florence (SC), Fort Walton Beach, Fort Wayne, Gainesville, Grand Rapids, Greensboro, Greenville (NC), Greenville / Spartanburg, Gulfport / Biloxi, Harrisburg, Hilton Head, Huntington (WV), Huntsville, Indianapolis, Jackson, Jacksonville (FL), Jacksonville (NC), Knoxville, Lexington, Little Rock, Louisville, Lynchburg, Madison, Manchester (NH), Marsh Harbour (begins December 22, 2018), Melbourne (FL), Memphis, Milwaukee, Mobile, Montgomery, Montréal--Trudeau, Myrtle Beach, Nashville, New Bern, New Orleans, New York--LaGuardia, Newport News / Williamsburg, Norfolk, North Eleuthera (begins December 22, 2018), Oklahoma City, Omaha, Panama City (FL) (begins June 8, 2018), Pensacola, Peoria, Pittsburgh, Portland (ME), Richmond, Roanoke, St. Louis, Salisbury (MD), San Antonio, Sarasota, Savannah, Shreveport, South Bend (begins June 7, 2018), Springfield / Branson, Syracuse, Tallahassee, Toledo, Toronto--Pearson, Tri-Cities (TN), Tulsa, Washington--Dulles, Washington--National, White Plains, Wilkes - Barre / Scranton, Wilmington (NC) Seasonal: Bangor, Freeport, George Town, Hatteras (begins June 1, 2019), Kansas City, Key West, Nantucket (begins June 23, 2018), Raleigh / Durham, Rapid City </Td> <Td> </Td> </Tr> <Tr> <Td> Delta Air Lines </Td> <Td> Atlanta, Detroit, Minneapolis / St. Paul, Salt Lake City </Td> <Td> </Td> </Tr> <Tr> <Td> Delta Connection </Td> <Td> Cincinnati, Minneapolis / St. Paul, New York--JFK, New York--LaGuardia Seasonal: Detroit </Td> <Td> </Td> </Tr> <Tr> <Td> Frontier Airlines </Td> <Td> Austin, Denver, Orlando, Philadelphia, Trenton Seasonal: Providence, San Antonio (begins August 12, 2018) </Td> <Td> </Td> </Tr>

What is the airport code for charlotte north carolina