I didn't use the call center, but I'm on a paid AA codeshare in F and so far no problem booking the chauffeur online. Actually, it was easy. First I called AA to get the EY booking reference/PNR code. Once I had it, I entered it into the appropriate box on the Etihad online chauffeur booking system at the EY website. It found my rezzie without problem, asked for input about my required transportation options for each eligible flight on the itinerary and that was it. They're supposed to send me a confirming e-mail; we'll see if/when it arrives and what it says.