Involved in the biosynthesis of volatile esters which confer ripe apple fruit flavor (By similarity). Alcohol acyl transferase that can use a wide range of alcohols as substrate to produce esters (By similarity). The fruit of cv. Royal Gala exhibits a high ester accumulation, whereas the cv. Granny Smith contains low ester levels; this influences strongly the ripe apple fruit aroma. Belongs to the plant acyltransferase family.