ILUV767 - I can think of a couple of reasons for United having finished sooner. Firstly, they started considerably before American did... about 6 months earlier. Secondly, American has a bigger job to do in each aircraft, as they are repitching the entire plane rather than just a few rows. Thirdly, American is repitching ALL of their planes, while United only implemented Economy Plus in select planes. Finally, American's fleet is considerably larger than United's to begin with, so they have many more aircraft to work on. In the end, American's More Room Throughout Coach program requires a lot more work than United's Economy Plus.
As to whether AA will have to charge more, that remains to be seen. However, I don't believe that they will. You can see that they haven't raised fares yet - they still match fares with the other carriers. I've read that, if they can average one extra passenger per flight due to the superior product, they can make enough money to not lose profits. Realistically, most flights did not go fulkl anyway - average load factors hover around 70-75%, and they are only removing 10-18 seats per aircraft, far less than 25%.
SIA fan - 2 comments for you...
First, I agree about the interiors! American has such a beautiful interior product now, and it has been introduced to most fleet types other than the 757. I am still trying to figure out whether the 757 will be getting the new seats, carpets, etc. or not. I certainly hope they do, as I would now prefer to fly on an MD-80 (with the new interior) than on the 757 (without the new interior). They operate a pretty significant fleet of 757s, and on some pretty long flights (I took one SJC-BOS earlier this month, and they operate a lot of other transcons), so you'd think that they would want to upgrade them to the new fleet standard.
Second, I think that I know the reason for the seats in the front seeming to have more pitch... they probably do. Because the emergency exists are fixed in place, the only fair way to remove 2 rows of seats was to take one from in front of the exists and one from behind the exists, while leaving the exit rows lined up with the exit windows. If there are fewer rows ahead of the exits than behind them, then the rows in front will have slightly more room than the rows behind. I think that this is the reason for the difference.