Jusqu-a Airmail Markings- A Study Ian Mcqueen -

These markings are vital for postal historians because they answer specific questions: Did a particular airmail cover travel by air the whole way? If not, why was the air service truncated? At which exchange office did the transfer to surface transport occur? And crucially, what were the rates and regulations that governed such hybrid air‑surface services?

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 . Jusqu-a Airmail Markings- A Study Ian McQueen

Ian McQueen's Jusqu-a Airmail Markings remains a masterclass in specialized philatelic literature. It turned an overlooked aspect of airmail routing into a rich, structured field of study. For any serious collector of 20th-century postal history, understanding McQueen’s findings is essential to unlocking the true historical value and story of international airmail covers. These markings are vital for postal historians because

A clerk stamped or wrote a directive on the envelope indicating where the air transit must stop. And crucially, what were the rates and regulations