Noone's proposed alien spacecraft here--just ufos/uaps.
What kind of "mundane
craft" (your word) would be consistent with all aspects of these sightings?
I think that arguments favoring "mundane" explanations have considerable validity and persuasive power. (It's basically the same argument that David Hume deployed against religious miracles.) When confronted with unknown phenomena, it makes sense to favor explanations that in our experience are more likely. But that doesn't establish the certainty of the dismissive conclusion, since it remains possible that something seen in the sky wasn't the planet Venus at all.
While there might indeed be plausible 'mundane explanations' for this or that particular aspect of an event (the idea of 'mundane explanations' needs a lot more exploration and will probably turn out to be problematic, based as it is on one's preexisting expectations), it becomes less and less plausible to imagine that many such 'mundane' events came together in just such a way as to explain all the aspects of a complex and multi-faceted mysterious event.
The 'tic-tac' seems to me to be a paradigmatic example of this more puzzling kind of UFO case. Maybe the cruiser's radar was acting up and producing false contacts. (Plausible, radars sometimes do that) Maybe the weak contact that the E-2 got at the same location was spurious. (Plausible, except it was at that same location.) But this kind of dismissive speculation seems to be inconsistent with the visual sightings by pilots directed to the location of the contact. Maybe the water turbulence was indeed caused by frolicking whales. (Plausible) But that doesn't explain the correlation with the radar contact and with the pilots' observation of the 'tic-tac' with that same spot. Maybe a pilot was letting his imagination get carried away and was mixing up memory and imagination when describing the 'tic-tac'. (Plausible.) But multiple pilots reported seeing it. And what's more, it was even recorded on at least one of the aircraft's targeting pod's video., which presumably lacks enough imagination to confabulate.
Put it all together, and this is about as good a UFO sighting as one could possibly hope to have. The probability of multiple mundane explanations combining in just such a way as to produce it seems inherently less likely to me than the truth of the thesis that something was indeed physically there that showed up on radar, agitated the water below, was observable to the naked eye and recorded in visual light and IR wavelengths. It's Ockham's razor. (It's also
consilience.)
I don't want to jump to the conclusion that it was space aliens.
The conclusion that I favor (It's more of a lemma)
is merely that this is a fascinating and puzzling report that strongly suggests that something was indeed physically there. What it was, I don't have a clue. (I did speculate about UCAVS earlier in the thread, but it's just a speculation and I'm not wedded to it.) Whatever it was, it does seem to be unusual and unexpected, hence extra-mundane. (Where 'mundane' means 'ordinary and not interesting'.)
I think that any intelligent person with an open mind should find these reports (the
Nimitz report and similar later one) fascinating and puzzling. But instead there seems to be this reflexive knee-jerk reaction: UFO's! Bullshit! Minds snap tightly shut.
And that's supposed to be "science".