Legislation to require all aircraft flying around busy airports to have key locator systems to prevent midair collisions failed to win approval in the House on Tuesday.

Key senators and the families of the 67 people who died when an airliner and Army helicopter collided near Washington, D.C., are convinced advanced aircraft locator systems that experts have been recommending for decades would have prevented the crash.

Families and emergency responders are marking the one-year anniversary of the deadly plane collision over the Potomac River.

So many things went wrong last Jan. 29 to contribute to the collision between an airliner and a U.S. Army helicopter that killed 67 people that the National Transportation Safety Board isn’t likely to identify a single cause at its hearing Tuesday.

The head of the Federal Aviation Administration has told Congress that the agency must do more to ensure flying remains safe after a midair collision over Washington, D.