They have been watching for "abnormal behaviour" at France's biggest airport, Aeroports de Paris (ADP) said.
Among other extra security measures, a facial recognition system will be tested in the next few months.
Instead of passengers having to place their finger on a screen to be identified, the system will immediately recognise their face.
"If a person poses any problems... An alert will automatically be sent to the police who will come and question them," ADP chief executive Augustin de Romanet said.
The number of security cameras has been increased in areas of the airport "where we need to be able to keep a closer eye on the comings and goings", he said.
Suicide bombers detonated their explosives in the check-in area of Brussels airport on March 22 and at a metro station, killing a total of 32 people.
Like the Paris attacks in November which killed 130 people, they were claimed by the Islamic State group.
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