Jusqu-a Airmail Markings- A Study: Ian Mcqueen

Ian McQueen’s Jusqu'à Airmail Markings: A Study (1993) and its 1995 supplement are considered essential reference works for aerophilatelists, documenting "partially flown" mail covers. The study acts as a comprehensive guide to worldwide "Jusqu'à" markings, which indicate the point at which mail transferred from air to surface transport. For more details, visit airindiacollector.com.

3. Chronological Framework (When to Look)

McQueen’s most valuable contribution is his dating of the markings. He proved that the Jusqu’à system was not static. Jusqu-a Airmail Markings- A Study Ian McQueen

refers to a specific type of instructional mark found on historical covers. The term "jusqu'à" is French for "as far as" or "until," and these markings were used to indicate that a piece of mail was only to be carried by air for a portion of its journey. The Purpose of Jusqu'à Markings Ian McQueen’s Jusqu'à Airmail Markings: A Study (1993)

Postal Function and Meaning

• Service limit indicator: Notifies that airmail service was prepaid only up to the named point; beyond that point mail proceeded by surface transport or different contractual arrangements.
• Routing instruction: Guides postal clerks and carriers on preferred air segments versus land/sea onward carriage.
• Customs/inspection signal: In some cases, jusqu’à notations helped customs or military censors identify which part of the route required inspection or which authority had jurisdiction.