This article explores the origins of these markings, McQueen’s groundbreaking classification system, and why his 1980s study remains the gold standard for authenticating covers from the golden age of aviation.
McQueen reconstructs the postal process: Jusqu-a Airmail Markings- A Study Ian McQueen
In the early to mid-20th century, airmail networks were inconsistent and expensive. A sender might pay the airmail surcharge for a trans-oceanic flight but not for the subsequent rail or sea transport in the destination continent. The Directive: This article explores the origins of these markings,
McQueen divided Jusqu’à markings into four operational zones: McQueen’s groundbreaking classification system