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The National Transportation Safety Board also released a trove of documents related to the fatal midair collision in January between an Army helicopter and a regional jet at Reagan Airport.
Karoun Demirjian
Federal investigators on Wednesday are expected to begin providing the clearest picture yet of what went wrong earlier this year when an Army Black Hawk helicopter crashed into an American Airlines regional jet outside Washington, D.C., killing 67 people and touching off a crisis of confidence in air travel safety.
