Jim Cramer answers viewers Twitter questions on the floor of the New York Stock Exchange with TheStreet’s Brittany Umar. Although Cramer is concerned about overcapacity in the airline industry, when asked about Southwest Airlines (LUV), Cramer believes that is the time to hold onto Southwest. Cramer said that Southwest has had ‘quarter after quarter of greatness’ and he has confidence that Gary Kelly, chairman and CEO of Southwest, is a superior CEO. In terms of the Southwest’s stock, Cramer said, ‘to sell it here is wrong. To buy it here might be right.’ Getting away from airlines, Cramer does not like Sarepta Therapeutics (SRPT) and would instead suggest going with Alder Biopharmaceuticals (ALDR) and Radius Health Inc. (RDUS). To which he adds, ‘those are the ones! Don’t deviate!’ On being asked about McDonald’s (MCD), Cramer said that he was working on a surprise piece with one of his colleagues at TheStreet that will ‘blow the doors off McDonalds,’ and that it will ‘make everyone on Twitter participate.’ However that was all Cramer was willing to share in regards to his upcoming surprise project.