pdx
Portland International Airport
PortlandOregonUSA
Before the 1930’s, airports had two-letter codes. When codes switched to three letters, many added the letter ‘X’ to the end. PD (Portland) became PDX.
photo by
Kerry L
Airport CodesBefore the 1930’s, airports had two-letter codes. When codes switched to three letters, many added the letter ‘X’ to the end. PD (Portland) became PDX.