Carolyn,

the aero-bars are one of the most vivid memories of my childhood - they were small bars, costed 17 stotinki in the late 1960s (roughly the price of a pound of yogurt), were wrapped in white silver folio, blue paper over it with a small Balkan airlines plane on it with the letters LZ. It had a rare taste, the bars were not always available in shops (as many other items) and we were so fond of them.