United and Continental could announce a merger agreement as soon as Monday, according to reports. A union between the two carriers would create the world's largest airline. The Wall Street Journal, citing a person close to the talks, reported that United would be the surviving brand and that United CEO Glenn Tilton would be chairman of the combined airline. Continental CEO Jeff Smisek would be the CEO, according to the Journal source. Reuters is reporting that Continental and United have agreed to an exchange ratio of 1.05 United shares for each Continental share.