LONDON, April 22 - U.S. stock futures traded flat early on Tuesday, pointing to a steady start on Wall Street in a session packed with earnings from some of the largest blue-chips such as AT&T , Yahoo and McDonalds .

Stock futures traded flat early on Tuesday, pointing to a steady start on Wall Street in a session packed with earnings from some of the largest blue-chips such as AT&T, Yahoo and McDonalds.

Stock futures traded flat early on Tuesday, pointing to a steady start on Wall Street in a session packed with earnings from some of the largest blue-chips such as AT&T, Yahoo and McDonalds.