An xONEx reissue is presumably what happens when the passenger wants to change routing and it presumably is worth $125 because the rate desk has to scratch their non-computerized collective heads for a long time to calculate the price of the new ticket. That didn't sound like what needed to be done in this case.

I expected AA to charge a fee nonetheless because one time they wanted $125 - which they assured me was NOT a reissue free - because I wanted to fly LAX-LHR on AA instead of BA, and I was holding an ONE coupon on BA stock that had a BA flight number written on it. Fortunately this was at LAX so I simply walked next door to the BA ticket counter (imagine that - a real ticket counter!) who politely stickered the coupon.