I have already posted the skeptical analyses of these events. I can expand on them further, but what really seems unlikely about these events is that they involved numerous US planes, yet not one of the pilots has come forwards. Yet when David Fravor observed his balloon tic tac, he was all over the US media. Could it be that the pilots at Stephenville saw nothing interesting?
I'm skeptical about any US sighting where US planes are involved, but no pilot comes forward. Fravor, and Underwood, and Slaight have proved that there is no stigma associated with reporting a sighting. On the contrary, you will be lionised.