- US probes Army helicopter altitude data in fatal January crash with jet Reuters
- Less than a second before hitting a passenger jet, helicopter instructor told pilot to change course, NTSB hearing reveals CNN
- Helicopter in fatal Washington plane crash was flying too high The Telegraph
- ‘It’s going to be a gut punch’: Families of Flight 5342 brace for days-long NTSB investigative hearing WAVY.com
- Helicopter in deadly DC airport collision had faulty altitude gauge, NTSB says BBC
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