The airlines, which are still operating as separate companies, said late Tuesday they flew paying passengers 16.15 billion miles last month, compared with 15.4 billion miles a year earlier.
The airlines’ combined number of available seats, or capacity, rose 4.1 percent. Their load factor, or occupancy rate, rose marginally – 0.5 percentage points to 80.9 percent.
So far this year, traffic is up at both airlines by 3.7 percent. Their capacity increased by just 1 percent in the first 11 months of this year, compared with the same period last year. Planes were slightly fuller, with occupancy up 2.1 percentage points to 83.3 percent.