They indicated that the sender had paid the premium airmail surcharge for the airborne portion of the route, while the remaining journey was covered by standard postal rates.

The term Jusqu'à is French for "as far as" or "up to." In postal history, a is a specific handstamp or annotation used to indicate the limit of a specific service or route.

Errors were common: covers with Jusqu’à Marseille that were inadvertently flown beyond Marseille are prized as “overflown” rarities.

For the collector holding a faded envelope from 1935 with a violet handstamp reading "Jusqu’a Karachi," McQueen’s text is the key that unlocks the flight, the fare, and the forgotten story of that letter’s journey. It remains, quite simply, the final word on the subject.

Examples: "Jusqu'à Karachi", "Jusqu'à London", or "Jusqu'à New York".

These critiques, however, are minor when balanced against the book's monumental achievement. It was the , and its influence continues to be felt across the philatelic community.

"Jusqu'a Airmail Markings - A Study" by Ian McQueen is a meticulously researched and well-written book that provides a comprehensive understanding of "Jusqu'a" markings. The book's clear organization, detailed analysis, and rich illustrations make it an essential resource for anyone interested in airmail markings, postal history, or philately. I highly recommend this book to collectors, researchers, and institutions seeking to expand their knowledge on this fascinating topic.

: The study covers various handstamps and air-cancel marks used globally.

During the golden age of airmail (primarily the 1920s through the 1950s), flying mail across oceans and continents was incredibly expensive. International postal agreements required countries to calculate exact transit costs based on weight and distance.

Ian McQueen’s work, first published in 1993, filled a major gap in philatelic literature by documenting these previously neglected marks.

A cover from Paris to Buenos Aires with a Jusqu’à marking reading “Jusqu’à Rio de Janeiro” would fly to Rio, then travel the rest of the way to Buenos Aires by steamer or rail.

In the realm of aerophilately, few works are as definitive as Ian McQueen's Originally published in 1993, this ground-breaking text—and its subsequent 1995 supplement—transformed a previously neglected niche of postal history into a structured field of academic and collectible interest. Understanding "Jusqu'à" Markings

Perhaps the most famous, serving as the jumping-off point for airmail from France to South America.

Ian McQueen’s research into "Jusqu’à" markings remains the definitive study for aerophilatelists. These postal markings, typically applied by handstamp or manuscript, dictated exactly where an airmail service ended and where surface transport began.