Southwest Airlines Co.’s (LUV) top line is benefiting from continued recovery in air-travel demand (mainly on the leisure front). Continued recovery in air-travel demand (mainly on the leisure front) bodes well for Southwest Airlines. In the fourth quarter of 2023, air traffic, measured in revenue passenger miles, increased 13.7% year over year to 35.58 billion. Capacity or available seat miles (ASMs) climbed 21.4% year over year to 45.51 billion. Load factor (percentage of seats filled by passengers) came ...