Using basic Flight Info logic, we can assume by this announcement that UA and CO will merge by then end of the week.
http://finance.yahoo.com/news/Continental-Airlines-to-Move-prnews-3387689653.html?x=0&.v=1
http://finance.yahoo.com/news/Continental-Airlines-to-Move-prnews-3387689653.html?x=0&.v=1