Could the Dames Point Bridge collapse if struck by a vessel? The NTSB says the bridge is one of 68 needing further study to answer that question.

The National Transportation Safety Board uncovered more than 15,000 “near-miss events” between helicopters and jets at Reagan National airport in just three years leading up to the American Airlines jet and Army helicopter collision that killed 67 people.

The Bering Air flight that crashed in sea ice off Alaska, killing 10, was over the weight limit for a "flight into known or forecast icing conditions," the NTSB said.