A timeline of air disaster near Washington, deadliest in US since 2001
<p>More than two weeks after a helicopter and airplane collision near Reagan National Airport near Washington D.C. killed 67 people, investigators have completed their work at the scene where both aircraft fell into the Potomac River in the deadliest U.S. air disaster since 2001.</p><p>The National Transportation Safety Board offered a detailed timeline Friday of the events leading up to the crash, but there are…