I have seen the 777 lots of time in the DR. What's wrong with that? AA is forced to take delivery of two additional 777 that they don't need right now, so they need to put them on the air. NYC-SDQ is a very popular route and that's why the use the AB6 which is a little older but used to be the 777 11 years ago, so I really don't see the problem on why using that airplane on the route. 777 is mainly used for trasatlantic and deep south american flights (not to mention ASIA because is a different configuration) which flight times are throughout the night. Are you going to leave the airplane doing nothing during the day? I guess not....
Btw, I used an AA example, but same rules apply to CO.
American cannot delay Boeings due in 2003
American Airlines will take delivery of 11 Boeing jets this year that it doesn't need and can't afford after the airline had done all it could to persuade Boeing to allow it to put off taking the planes, without success.
Last year Boeing already agreed with American to postpone deliveries of 34 planes due in 2003, 2004 and 2005. This number included 8 aircraft due for delivery this year.