A superdimensional or supradimensional species has always made more sense to me than a vaguely "interdimensional" notion for other beings. In this sense, I would believe more that the beings existed in either a 4dimensional, 5 dimensional or even maybe 2 dimensional space that we cannot perceive adequately, but could exist directly adjacent to us. It could even explain some of the more confusing characteristics: i.e. appearing from "nowhere" would be them approaching from the unseen dimensions from our perspective, similar to you approaching a two dimensional drawing from above - or also their apparent lack of requirement to abide by our physical laws, if they exist with additional unseen dimensions this might be paltry to them.
Aliens would be a really, really bad outcome for humans. Technologically inferior societies get ####ing bulldozed in a historical context, and we are likely to encounter increased disease and other problems depending on their intent (or if they are biologically similar to us in any way, I guess.) Something that has been living unseen alongside us for some amount of time would certainly be paradigm altering for the world, but it doesn't present the same enormous risk to all of us remaining alive that actual aliens would.
More likely these are a private human interest of some sort. Maybe some secret global cabal- as unlikely as this sounds, it's orders of magnitude more likely than aliens or extradimensional beings.
MOST likely, the US has been superseded by a rival foreign power in the aerospace technology realm, and said opponent is still keeping its cards close to its chest.
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