The Double ''A" side was based on radio airplay, not sales. If both sides of a single received similar airplay they were designataed such.
on topic - I fell in love with SFF when I was a small boy in short trousers, I will love it the day they close my coffin lid. Total perfection, the dreamy/druggy type feel conjures the trippy/dreamy type imagary of trying to recapture youth.
And charts are based on sales? How did they (the chart people) know what side was being bought?