So this in not going to happen.

1) NYC is 3 airports together. They would have to diverge almost all of JFK to have this happen.

2) LH no longer owns a big chunk of them. They sold all of there position in 2012.

3) B6 is making a killing feeding international carriers. They do not need to be part of the star.

4) the DOJ will not let a low cost carrier be absorbed into a legacy so they can see the tickets prices skyrocket. The local congressmen and senators will block it. (Local being New York, Florida, California).