Airline passengers from countries outside the European Economic Area (EEA) landing at UK airports from Monday will no longer be required to complete the forms to be handed to immigration officers along with passports.
The Act follows the high-profile case of Bangladeshi-origin British schoolgirl Shamima Begum, who had travelled to the ISIS-controlled region over four years ago before discovery in a detention camp earlier this year.
Hanzalah Patel, from the British city of Leicester, denied the charges but was found guilty by a jury at the end of a trial at Birmingham Crown Court in April.