You are right, "Aye, Aye" is more common but "Ay, Ay is also used:Originally Posted by Vincent Tailors
Mark Twain - Extract from Captain Stormfield's Visit to Heaven"Ay-ay, sir!" "Send two hundred thousand million men aloft to shake out ... "Ay-ay, sir!" In about a second I begun to see I'd woke up a pretty ugly ...
mark-twain.classic-literature.co.uk/extract-from-captain-stormfields-visit-to-heaven/
Nic Revel, by George Manville Fenn, Chapter 08“Ay, ay, sir!” “And keep eye to west’ard on and off all day, ... “Ay, ay, sir!” “And in the course of the morning you will go quietly round and tell the ...
www.athelstane.co.uk/gmanfenn/nicrevel/revel08.htm
Syd Belton, by George Manville Fenn, Chapter 26“Ay, ay, sir!” cried Strake; his whistle sounded shrilly against the sides ... “Ay, ay, sir. Now, my lads, be smart, and we’ll have that gun up in a jiffy. ...
www.athelstane.co.uk/gmanfenn/sydbeltn/beltn26.htm
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