I was able to get/confirm the chauffeur service trough twitter, but the pick up time was 1:20am for my 3:25am flight, which I have to ask them to change it 9pm because the Resort was 90~120 minutes from AUH airport. Then I have to call (US number) to change it to 7pm, after a 6 minutes on hold they did it without any issue (yhe driver arrived around 6:15pm).
Keep in mind did the booking after August 12 (September/October), just a few minutes after I got an alert from ExpertFlyer or awardwallet about a time change, then 12hs later AA send me an email with a new e-ticket number.
Now if you had a schedule change (re-ticketed), then your chances are very low. Just try twitter (complain first) and with a Direct Message they may help you out
