Passenger traffic at American Airlines and American Eagle rose 2.4 percent in June, according to the carriers' parent company, AMR Corp.
AMR said it boosted capacity by 2.6 percent and its consolidated load factor declined slightly, down 0.2 percentage points to 86.9 percent.
Unit revenues also grew 1.7 percent compared to June 2012, a record-high for any month, AMR said.
International traffic increased 5.5 percent as the carriers added 6.4 percent more capacity. Its international load factor dropped 0.7 percentage points to 85.6 percent.
Domestic traffic rose to 0.5 percent on a capacity increase of 0.3 percent. Its domestic load factor was 0.2 percentage points higher at 88.8 percent.