Pennsylvanians may need to start showing their passports for domestic flights if the state legislature doesn't pass a bill bringing state ID and driver license laws into compliance with the federal Real ID Act.

The clock is ticking as the June 6 deadline imposed by the U.S. Department of Homeland Security approaches. On that date, Pennsylvania-issued identification cards and driver's licenses are set to become unusable when attempting to board a flight or visiting a federal building. The federal buildings prohibition exempts federal courthouses, however. Passports would be the only acceptable documentation to use if the state legislature doesn't pass a bill prior to the deadline.

The state House voted along party lines to amend a Senate bill that would have created a two-tiered system that provides Pennsylvanians with either a standard driver's license or state identification card or a Real ID Act compliant driver's license or ID card.