In 1989, Belém airport still had no radar, and so the Controller informed Flight 254 that it was the only one in its airspace, and gave it landing clearance.
1989年的当时，贝伦机场还没有雷达，因此管制员告知254次航班，他们是这片空域的唯一一架飞机，并给予了降落许可。