A leading transport union has slammed security measures at the nation's airports saying a high turnover of staff means workers without security clearance are being granted access to high-risk areas.

The Transport Workers Union on Tuesday also raised concerns over a lack of passenger and freight screening at regional airports, saying “appropriate” security needs to be in place Australia-wide. TWU national secretary Tony Sheldon was speaking days after authorities thwarted an alleged Sydney-based terror plot to blow up an aircraft….