![Photo shows empty desks desks at departure hall during a strike by Belgian trade unions at Zaventem international airport in Brussels, Belgium, Feb. 13, 2019. All flights in and out of Belgium have been cancelled for a day due to strike action, the country\'s air traffic control has announced on Tuesday. (Photo/Agencies)](http://www.ecns.cn/hd/2019/02/14/217793e81797466cb4aa73135d92e479.jpg)
Photo shows empty desks desks at departure hall during a strike by Belgian trade unions at Zaventem international airport in Brussels, Belgium, Feb. 13, 2019. All flights in and out of Belgium have been cancelled for a day due to strike action, the country's air traffic control has announced on Tuesday. (Photo/Agencies)
![Photo shows flight information board displaying cancelled flights during a strike by Belgian trade unions at Zaventem international airport in Brussels, Belgium, Feb. 13, 2019. All flights in and out of Belgium have been cancelled for a day due to strike action, the country\'s air traffic control has announced on Tuesday. (Photo/Agencies)](http://www.ecns.cn/hd/2019/02/14/8e4b4c65314b476f8ae56af992c189cd.jpg)
Photo shows flight information board displaying cancelled flights during a strike by Belgian trade unions at Zaventem international airport in Brussels, Belgium, Feb. 13, 2019. All flights in and out of Belgium have been cancelled for a day due to strike action, the country's air traffic control has announced on Tuesday. (Photo/Agencies)
![All flights in and out of Belgium have been cancelled for a day due to strike action, the country\'s air traffic control has announced on Tuesday. (Photo/Agencies)](http://www.ecns.cn/hd/2019/02/14/5893a916669c4f228b97e02c0fd31189.jpg)
All flights in and out of Belgium have been cancelled for a day due to strike action, the country's air traffic control has announced on Tuesday. (Photo/Agencies)