This doesn't make sense for a "meteor". The atmosphere is less than 200 miles thick, and the chance that a meteorite will skim across that relatively thin layer of atmosphere long enough to be sited along a 700-mile path over multiple states is infinitesimal. Multiply that by the tiny fractional probability that it would have enough mass to burn that long and the odds look impossible.

More likely, this was a massive satellite in near earth orbit. That's really the only reasonable thing which would match the observations.

So, since it's not being reported as a satellite it's probably a secret satellite. We already know that NASA launches classified payloads. It's safe to assume that other countries do too. Stealth technology would be simple, just build it with flat metal sides painted black and power it with a self-contained reactor (and there's your mass).