Concerns that planes could be targeted in cyberattacks are prompting U.S. officials to re-energize efforts to identify airliners’ vulnerability to hacking.

The revived program, led by the Department of Homeland Security and involving the Pentagon and Transportation Department, aims to identify cybersecurity risks in aviation and improve U.S. cyber resilience in a critical area of public infrastructure, a DHS official said. DHS is offering few details on the program but says it will involve some limited testing of actual aircraft.

...