Hi,
It's my first time booking a flight on Etihad, and I found some strange issue when trying to enter my Advantage number in the "Loyalty programme" field. Despite having no issues if I enter my new Etihad Guest number, or my ANA Mileage #, I got an "invalid format" error when entering my AAdvantage number there.
My only explanation is something related with the number+letter format in AA's #, unlike Etihad and ANA's # (all numbers), so maybe that field is only accepting numbers. Or maybe there is a recent issue between Etihad and AA and AAdvantage is not welcomed anymore? Anyone else having the same problem?