Manchester United cruised to the Carling Cup final with a dramatic 4-3 aggregate victory over Manchester City, thanks to an injury-time header from Wayne Rooney. United overturned their 2-1 defeat at City last week to win 3-1 at Old Trafford, with goals from Paul Scholes, Michael Carrick and the in-form Rooney. Once again, City's Carlos Tevez scored against his former club, but his strike wasn't enough for Roberto Mancini's team. United will meet Aston Villa in the final next month after the Villans outclassed Blackburn 7-4 on aggregate last week. Rooney's Winner