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Originally Posted by abmj-jr
When the City of Fresno, which owns the former Fresno Air Terminal, changed the name to the rather grandiose and somewhat inaccurate Fresno-Yosemite International Airport, it just took a vote of the city council. The airport code, however, remained the (in-)famous FAT.

Well before the change, there were proposals to name FAT after such longtime pols as B.F. Sisk and Ted Wills, but they (thankfully) never went anywhere.
Also, when the name did get changed, the city did inquire as to what would be involved to change the designation to FYI, but they quickly abandoned the idea.