Key indices ended mixed yesterday

On Wall Street, key indices ended mixed yesterday. With the S&P 500 closing nearly flat, Banking shares fell amid warnings of potential losses from a hedge fund's default on margin calls, while optimism over the economy limited the day's declines.   Shares of aircraft-maker Boeing rose after the company reached a deal with US budget carrier Southwest Airlines for a variant of the 737 MAX aircraft.   Meanwhile, Nomura and Credit Suisse are facing billions of dollars in l...