Apart from the usual standard operating procedures, airlines in the U.K. may now reject Britons which they believed are flying out of the country in a bid to join the radical group ISIS Daesh.

Under the laws proposed by Home Secretary Theresa May, passengers, including children, whom the airlines suspect are travelling to take part in activities related to terrorism in places like Syria will be rejected from boarding. A report by Reuters said at least 600 Britons have left their native land to go to Syria or Iraq to join the militant groups.

The airlines will know they are soon to be boarded by high-risk travellers based on the passenger list they have, that will be flagged by an automatic system. This will enable them to stop the would-be rebel from boarding the aircraft.

Britain's Express newspaper said airlines would be required to submit full passenger lists before landing in the U.K. Failure to do so translates to a £50,000 fine. The Sunday Times reported at least one in five airlines currently refuse to provide copies of such passengers lists.

"This important legislation will disrupt the ability of people to travel abroad to fight and then return," James Brokenshire, a junior minister for security in May's department, said in a statement. "It will also enhance our ability to monitor and control the actions of those who pose a threat," he added.

The new proposed legislation comes three weeks after three London schoolgirls left Britain to join up with Islamic State through Turkey. They were able to leave via commercial airliner Turkish Airlines. They were among the 60 British women, including 18 teenagers, believed to have travelled to Syria to join the ISIS Daesh militants, according to the Guardian.

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