<p>Washington: President Donald Trump on Thursday said US authorities have "strong opinions" on what caused the deadly collision between an American Airlines regional passenger plane and a US Army Black Hawk helicopter.</p><p>"We do not know what led to this crash, but we have some very strong opinions and ideas," Trump said at a news conference.</p>
<p>Washington: President Donald Trump on Thursday said US authorities have "strong opinions" on what caused the deadly collision between an American Airlines regional passenger plane and a US Army Black Hawk helicopter.</p><p>"We do not know what led to this crash, but we have some very strong opinions and ideas," Trump said at a news conference.</p>