I believe Thunderbird and Night Train are only aged a couple of hours.
LOL! I think maybe a little longer than that, but not by much. My dear old Dad invented Thunderbird, and then moved on to Night Train. Also came up with Ripple a few years later.
And no, I won’t tell you his name, but I will say that he was the original winemaker for what was to become the biggest winery in the world. Worked for them for sixty years, until his death.
"Aged in transit" is the scientific term you're looking for.