What is the effect on flavor profile if using first-fill American oak barrels that have been seasoned for 36 months as opposed to 12 months?

Using first-fill American oak barrels seasoned for 36 months as opposed to 12 months will significantly alter the flavor profile of the aged spirit. Seasoning refers to the process where oak staves are air-dried outdoors before barrel construction. Longer seasoning times result in a more mellow and nuanced flavor extraction during aging. A 36-month seasoning period will lead to a more subtle and integrated oak influence. The longer air-drying period reduces the concentration of harsh tannins....