A European lawmaker pressing for a Europe-wide system using air travel information to fight terrorism says that delays could lead to a patchwork of schemes that let suspects slip through the net.

British Conservative lawmaker Timothy Kirkhope said Thursday that without a single Passenger Name Record system, "diversity can only benefit those who would do us harm."

Kirkhope is pushing new draft PNR legislation through the European Parliament but strong privacy concerns remain an obstacle.

EU leaders said early this month they want the assembly to "urgently" adopt a PNR system, with some nations saying it could help halt the flow of fighters heading to Syria and Iraq.

With legislation on hold for two years now, more than a dozen countries are looking at developing their own systems.