On 1 July 1948, U.S. Air Force C-47 transports stood in line at Berlin's Tempelhof Airport while food was unloaded into waiting army trucks. This was the early Berlin Airlift supplying the western sectors after land routes were blocked.
The direct record for this candidate is not a civilian ration queue but the ordered wait of aircraft and trucks. The article therefore does not invent a line of shoppers; it shifts attention to logistics itself becoming a queue.
Food for the blockaded city depended on planes entering an airport one by one and cargo passing to trucks in sequence. Before any shop line formed, the supply network was already waiting on the runway.