Weather and the helicopter's age could have played a role in the crash: Aviation analyst

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Kyle Bailey, an aviation analyst, says pilots who fly presidents are typically skilled and experienced, but the helicopter is a "very complicated machine".

"The issue is when you're taking off and the weather is clear, and then you're in mountainous, rugged, forest-like terrain, there could be fog developing in areas that you don't expect fog to develop," Bailey told Al Jazeera.

"And it wouldn't be on weather forecasts; it wouldn't be on maps; it wouldn't be on the radar. Fog could pretty much pop up anywhere very, very quickly, and very much sneak up upon the pilot."