SCADTA Pioneer Flight covers. 1921, cover from Bogota to New York, franked by 3c green, paid for surface delivery and uprated by violet air mail surcharge 30c on 50c pale green, appropriate SCADTA three-line and circular handstamps, mostly VF, A. Rendon certificate, C.v. $625 as for a stamp off cover (Image)

SCADTA Pioneer Flight covers. 1924, mixed franking cover from Hamburg to Bogota, franked by five German adhesives and Colombian 30c blue with ''A'' overprint in horizontal strip of four, upon surface arrival to Colombia posted to Flight ''Barranquilla - Girardot'' and then for ground delivery to Bogota, underpaid and marked ''T. 0.30'', arrival ds, minor conveyance flaws, still F/VF, mounted on page from a Collection (Image)