Allt-a-Bhainne 17 Years Old 2005 (Alistair Walker Infrequent Flyers)

Distilled in 2005 and bottled by the Alistair Walker Whisky Company in 2023 under the Infrequent Flyers imprint, this is a 17 Years Old Allt-a-Bhainne at 60.1% ABV from ex Bourbon maturation. The release is one of 266 bottles, sister to multiple other Infrequent Flyers selections from this 2005 Allt-a-Bhainne vintage.

Allt-a-Bhainne ferments malted barley for 48 to 50 hours on Mauri liquid yeast in closed stainless steel washbacks, then double distills through two copper wash stills and two copper spirit stills with steam heating and shell and tube condensers. The short Speyside ferment produces a clean malt forward spirit built as a blend filler for Chivas Regal, Passport and 100 Pipers. New make is reduced with Rowantree Burn water and tankered to Keith for cask filling and maturation, since the distillery holds no warehousing on site.

Ex Bourbon American oak frames cask contribution on vanillin and oak lactones from the toasted and charred staves, with Maillard chemistry from hemicellulose oak sugars driving honey and vanilla. The clean American oak palette suits Allt-a-Bhainne's lighter blend filler spirit. Seventeen years of ex Bourbon develops the cask profile to a settled mature phase, with the retained 60.1% strength preserving the higher esters from the short ferment that bottling at strength keeps intact. Cask strength bottling preserves volatile compounds that lower strength bottling would lose to dilution.