Air Traffic Controllers are on their second day strike at Brussels Airport which lead to more than 140 arrivals and departures being cancelled by mid-afternoon, according to flightstats.com.
"There is enormous damage to our country and our image," Prime Minister Charles Michel told USA Today.
Union leaders asked air traffic staff to call in sick on Tuesday due to disagreements over a proposed dispute settlement.
Belgocontrol, an air traffic agency, said it was working on a solution with the union over a rise in the minimum retirement age, as well as other issues.
"If we cannot count on simple human decency from such highly compensated professionals, then it’s time for governments to find ways to guarantee the availability of air traffic control services,” said Tony Tyler, director general of the International Air Transport Association, said in a news release.
Brussels Airport, one of Europe's busiest, has only been partially opened since April 3, after suicide bombers set off explosions killing 16 people.
"...Tomorrow still unclear: we'll keep you up-to-date," Brussels Airport tweeted at 7:56 a.m. April 13.
