I agree with your comment about the 767's being noisy. While I mostly fly United in business (Polaris), even though my final destination is in the Washington D.C area, I avoid the 764 from GRU to IAD, and also because there are no lavatories up front. Connecting thru IAH or ORD on a Dreamliner is better and provides additional miles towards my next million mile milestone. :-) I also try to avoid EWR as it is often a mess. However, I do occasionally use Azul thru FLL (next flight in Aug-not sure if it will be the A330 200 series or 900 series, they have been using both), and the experience there has been good and often less costly. Have even used Copa and was lucky to have their newer 737 Max9s with the lay flat seats on CNF-PTY-IAD. Was Ok, but service and food didn't seem as good and their lounge in PTY, while huge, has little in the way of food offerings. I upgraded some friends on one of their Copa legs to Uruguay and they thought it was wonderful, since they normally are in Economy!