Originally Posted by
jay_dubya
I'm guessing this allows them to test out the new seat without waiting for a complete overhaul of Y and any other modifications the old planes need.
I think you're correct.
The infrastructure changes probably require a full widebody C check prior to seats installation (wiring, etc.) and they apparently jumped on the first low-high Zodiac converted (initial test article) aircraft.
As AA intends to use this seat for about half of the 772 fleet, all 787-9 and A350 aircraft, it makes good sense to get an early shakedown in hopes of avoiding another Zodiac debacle.