Meanwhile, the Belgian Crisis Centre said it had revised the death toll up to 35 after four people died of their injuries in hospital.
The attacks were claimed by so-called Islamic State (IS).
The death toll does not include the three attackers.
Investigators have not commented on reports in the Belgian media that the third airport attacker is Faycal Cheffou, a freelance journalist who was arrested last Thursday outside the prosecutor`s office.
On Saturday a man named Faycal C was charged with "participation in the activities of a terrorist group, terrorist murders and attempted terrorist murders," a prosecutor`s statement said.
Separately, three men were charged on Monday with belonging to a terrorist group.
The three, whose names were given as Yassine A, Mohamed B and Aboubaker O, were arrested during raids on 13 addresses on Sunday. A fourth man was released without charge.
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