American Airlines and JetBlue are negotiating a codeshare agreement that could be put into effect as soon as 1Q2011 (TheStreet, 16-Aug-2010). An agreement is yet to be reached. The carriers announced plans in Mar-2010 to cooperate in New York and recently announced a reciprocal frequent flyer agreement.
American Airlines: “We are negotiating, working towards perhaps a code-share in the future… We're taking baby steps to make sure that what we are doing makes sense. Whatever we implement, we want to make sure it works,” Art Torno, Vice President for New York. Source: TheStreet, 16-Aug-2010.