I was checking the Continental website and I found that they are changing their DC10 aircraft to a state of the art 777 for EWR-MAD route.
I can´t tell if this route is that profitable, due to the fact that there are several daily flights from Madrid to New York. Although Continental´s is the only one at Newark.
FLIGHTS BETWEEN MAD-NYC
IBERIA daily 742 JFK
DELTA daily 763 JFK
AIR EUROPA three or four times a week 762 JFK
CONTINENTAL daily DC10 EWR