Good find! I don't find the news all that surprising to be honest with you. United is pretty maxed out on scope, certainly until January 2016, and even after that if they don't buy their own 190s, 195s or CS100s. They're probably still in the decision/negotiating process regarding those aircraft before they firm up any more 175s. These 5 aircraft are probably all they can put on line until they buy their own small NBs.