Combine the aged rum, gold rum, overproof rum, lime juice, grapefruit juice, cinnamon syrup and falernum in a shaker.
Add a dash of Angostura and six drops of absinthe.
Add a scoop of crushed ice and flash-blend or shake very briefly, 5 seconds.
Pour unstrained into a double old-fashioned glass or tiki mug.
Top with crushed ice and garnish with a mint sprig.
A 1958 descendant of Don the Beachcomber's Test Pilot, reconstructed by Jeff "Beachbum" Berry from surviving bar notes. The three-rum split is not showing off: each one does a job, and substituting a single rum flattens it.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Jet Pilot.