Two of the largest CPT/WTS schools were Piedmont Aviation, operated by Tom Davis, and Southern Airways, operated by Frank W. Hulse. Piedmont's school was based in Winston-Salem, North Carolina, while Southern had schools in Charlotte, North Carolina, Greenville and Camden, South Carolina, and in Birmingham and Decatur, Alabama. Both companies trained over 60,000 war pilots including young men from Brazil (Piedmont) and a large number of Royal Air Force pilots from England (Southern). By 1947 Davis had turned his school into Piedmont Airlines with scheduled passenger flights between North Carolina and Ohio. In 1949, Hulse had Southern Airways flying commercial service between Jacksonville, Florida and Memphis, Tennessee, and between Atlanta and Charlotte. Both airlines began operations with war surplus Douglas DC-3 aircraft that were modified for commercial service in their former CPT/WTS maintenance hangars.