Delta Air Lines (DAL) today posted its May traffic results, with system traffic up 2.2% from the year-ago month on a 2.2% increase in capacity making it the world’s largest carrier by traffic, surpassing American Airlines. Load factor is still at 83.9%, which is flat with last year. Domestic traffic also increased by 1.9% versus last year on a 0.4% increase in capacity. Load factor for domestic increased to 85.1%. International traffic is up 2.6% versus last year on a 5% capacity increase, with load factor down 2 points to 82.2%. The higher traffic is due to the consolidation of Delta's subsidiary Northwest Airlines, which was completely integrated into Delta network in January of 2010. DAL shares are down slightly 0.21% to $9.60.