Navy pilots recall “unsettling” 2004 UAP sighting – 60 Minutes – CBS News
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There's lots of conjecture around about these being sensor errors or tricks of the eye, but when you're spending millions to train people to become pretty much the best trained observers you can get - and they spot this kind of thing - how can you continue to dismiss it as a non-physical object.
"If" it's aliens there's not much you can do, though that's the less likely outcome I can see. More likely, "If" its a foreign power with exotic technology/ some new way to perform recon then that's a real concern, and dismissing it off-hand should be even more concerning.