Colombia: Private Air Companies: Compañía Colombiana de Navegación Aérea: 1920 (Mar.) 10c. green strip of four and single, 1920 (Oct.) 10c. green type 3 (2), type 4, se-tenant block of four, 10c. red se-tenant pairs (2) and blocks of four (2), 1920 (Nov.) 30c. on 10c. (faded). Photo. (Image1)