Southwest Airlines Co. shares LUV, were dipping in premarket trading Thursday, though the air carrier posted an adjusted earnings beat for its latest quarter. Southwest reported a fourth-quarter net loss of $219 million, or 37 cents a share, about even with the loss it posted a year earlier. On an adjusted basis, Southwest earned 37 cents a share, while analysts were expecting 12 cents a share. Operating revenue for the fourth quarter was $6.8 billion, while analysts were modeling $6.7 billion. “Our quarte ...