Mỹ: Nguy cơ tiếp tục hủy chuyến bay ngay cả khi chính phủ mở cửa trở lại
Chính phủ Mỹ dự kiến nới lỏng hạn chế chuyến bay tại 40 sân bay nhưng thiếu hụt kiểm soát viên không lưu có thể gây tiếp tục gián đoạn hàng không.
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