United Continental Holdings Inc., Chicago, expects to contribute $290 million to its defined benefit pension plans this year, according to an 8-K filed with the SEC on Thursday. At the company's investor day conference in November, it said it expects to contribute an average of $275 million in each of the next five years. United Continental oversees three pension funds — two for former Continental employees and one for former United employees. The plans had an aggregate $2.2 billion [...]