Airmail cover franked with 1937 10c scarlet & 2 x 1952 23c black & pale blue national issues plus 1950 1p purple & sage green AIR issue with large 'L' overprint of LANSA plus 1951 60c grey AIR issue with small 'A' overprint of AVIANCA (SG 488, 764, 17 & 16a) all tied by BOGOTA cds's with boxed registration marking alongside. Addressed to UK with light boxed 'Por Avion No. 5 CORREO AEREO TRANSOCEANICO' marking on front plus other transit cds's on reverse. Most probably flown by Avianca.