: It lists known markings by country, providing reference numbers for each and describing the "jusqu'à" cancels used worldwide.
Which specific flight legs were operational on a given date. Jusqu-a Airmail Markings- A Study Ian McQueen
A significant finding is that no British or US “Jusqu’à” marking exists in official postal use; Britain used “By Air Mail To…” cachets, which McQueen distinguishes as functionally similar but philatelically separate. : It lists known markings by country, providing
This book is a must-have for anyone interested in airmail markings, postal history, or philately. I strongly recommend it to collectors, researchers, and institutions seeking to add a valuable resource to their library. This book is a must-have for anyone interested
: These marks are rare and highly sought after by collectors because they tell a precise story of logistics, showing exactly where a letter transitioned from air to surface transport. Ian McQueen’s "A Study"
The study also aids in detecting forgeries, as McQueen includes detailed measurements and ink analyses.
In an age where email has killed the physical letter, the "Jusqu’a" marking stands as a monument to a time when sending a message across the world required a symphony of agreements. It represents the "partial payment" of hope—senders paying for just a few hundred miles of flight, trusting surface transport for the rest.