Scallywag,
But the book that came with my scanner listed the callsign as "Kestrel", many years before the change? I will track the book down at my parents house but I'm thinking mid 90s publication.
The AIH callsign definately stayed as "Tourjet" for years afterwards. That's what made me think they went from Kestrel to Tourjet then back to Kestrel....
The MD-83 story is interesting though, perhaps the book listed that "fleet" callsign whilst the 757/767 fleet still used Tourjet, then evetually the MD-83 was retired but for some reason around 1998-ish Kestrel was re-adopted across the board...
Interesting stories so far though... keep em comin'!