A globemaster is a huge cargo jet ,, as a military jet is was most likely on a “military air route” ,, I’m unfamiliar with details on how they are controlled but they are not handled by “regular” ATC... It seems likely that both civilian ATC and military ATC were involved and not talking to each other.
Does the Globemaster look something like the MD-80 in scale? Yarddog saw some weird stuff Saturday and took pics, we thought it was an MD-80. The craft didn’t break mach but alarmed him at how fast it shot going just N of East.