Southwest Airlines Co. reported preliminary traffic results for the month, fourth quarter and full year ended December 2018. For the month, the company reported revenue passengers carried of 11,211,115 against 11,077,369 a year ago. Revenue passenger miles were 11,069,368,000 against 10,713,293,000 a year ago. Available seat miles were 13,563,854,000 against 12,868,065,000 a year ago. Load factor was 81.6% against 83.3% a year ago. For the fourth quarter, the company reported revenue passengers carried of 34,432,204 against 33,695,001 a year ago. Revenue passenger miles were 33,715,984,000 against 32,189,839,000 a year ago. Available seat miles were 40,366,897,000 against 37,886,814,000 a year ago. Load factor was 83.5% against 85.0% a year ago. For the full year, the company reported revenue passengers carried of 134,890,243 against 130,256,190 a year ago. Revenue passenger miles were 133,322,322,000 against 129,041,420,000 a year ago. Available seat miles were 159,795,153,000 against 153,811,072,000 a year ago. Load factor was 83.4% against 83.9% a year ago.