The reason is that under the "open skies" policy of 1987 the strictly controlled industry was greatly loosened up and little Taiwan had seven airline companies fighting over its domestic air routes. (One of them, U-Land Airlines, went bankrupt in 2000, and only six companies now remain).
遠因是在 1987 年「開放天空」政策下，原本嚴格管制的航空業大幅鬆綁，小小台灣，竟有 7 家公司爭食國內航線（其中瑞聯已於 2000 年倒閉，現存 6 家）。