Jusqu-a Airmail Markings- A Study Ian Mcqueen — [upd]

Based on McQueen's study, potential areas for future research include:

Prior to Ian McQueen's meticulous research, information regarding these directional markings was scattered across obscure archival records and private collections. McQueen standardized the study of these markings, culminating in his highly sought-after philatelic literature, “Jusqu’à” Airmail Markings . Key Contributions of McQueen's Work Jusqu-a Airmail Markings- A Study Ian McQueen

Text enclosed in rectangular frames, common in European transit offices like Paris, Zurich, and Amsterdam. Based on McQueen's study, potential areas for future

South American or European mail often utilized high-speed transatlantic air routes but reverted to standard rail delivery once reaching the United States mainland. Based on McQueen's study