求翻译：2003年末，西南航在美国58个城市的59个机场之间共有337条非经停航线，这些航线平均航程558英里，平均飞行时间1.5小时，每天约有2800个航班。西南航的航线已遍布全美，从大西洋沿岸到太平洋沿岸，从加拿大边境到墨西哥边境。同时，西南航的航线布局又有一定的集中性，45％在西部，27％在东部，15％在中西部，13％在德克萨斯及周围。是什么意思？

In late 2003, Southwest Airlines between 59 airports in 58 cities in the United States, a total of 337 non stop routes, these routes are the average range of 558 miles, the average flight time of 1.5 hours, about 2,800 flights a day. Southwest Airlines routes across the United States, from the Atlan

End of 2003, Southwest Airlines in the United States 58 cities between the 59 airport there are a total of 337 non-stop by route, the route 558 miles average voyage, the average flight time approximately 1 hour per day, with 2800 flights. Southwest Airlines has flights from all over the United State

2003 year's end, the southwest navigation altogether had 337 in between the American 58 city 59 airports must after to stop the route, these route average range 558 miles, average flight time 1.5 hours, every day approximately some 2800 scheduled flights.The southwest navigation route has proliferat

In late 2003, Southwest Airlines in the United States in 58 cities of 59 total 337 non-stop routes between airports, these voyages 558 miles on average, with an average flight time of 1.5 hours, about 2,800 daily flights. Southwest Airlines ' routes all over the nation, from the Atlantic coast to th