Bomb threats were reported on two aeroplanes landing at Brussels airport in Zaventem, but one plane landed safely, Belgian state broadcaster VRT reported on Wednesday evening.
The departure hall at Brussels airport, hit in March by a deadly double suicide bombing claimed by the Islamic State group, will partly reopen on Sunday, the management said.
The Belgian government appointed a new transport minister in a reshuffle sparked by allegations of lax security at Brussels airport, one of two targets hit by suicide bombers last month.
Brussels Airport cancelled half its flights on Wednesday as anger mounted over a second day of strike action by some air traffic controllers hampering a return to normality after last month's suicide bombings.
Belgium has charged two new suspects with terrorist offences in connection with last month's deadly Brussels airport and metro attacks, the federal prosecutor's office said.
Belgian prosecutors launched a fresh appeal for help in finding a suspected third attacker in last month's bombings at Brussels airport, releasing new video footage and pictures of the so-called "man in the hat".
Brussels airport scheduled nearly 40 flights on Monday, as Belgium struggles to get back to normal after two suicide bombers blew themselves up in the departure hall nearly two weeks ago.
Brussels Airport reopened to a thin stream of passengers on Sunday, 12 days after suicide bombers destroyed its departure hall and killed 16 people.
Brussels Airport is to reopen Sunday, 12 days after its departure hall was wrecked by Islamic State suicide bombings, with chief executive Arnaud Feist announcing three flights.
Brussels main airport failed to reopen on Friday evening as planned because police and airport authorities could not agree on how to screen passengers arriving for flights following the March 22 suicide bombings.
Brussels airport will partially reopen for passenger flights on Friday evening after its closure following the March 22 bomb attacks, the company running the airport said.
Bomb-damaged Brussels airport held a drill for a partial restart on Tuesday but warned it could take months to reopen fully.
