LP \might\ have some insight.
ADS-B shows it heading home.
I always have to remind myself that \everything\ on ADS-B is there only because the military WANTS it to be seen.
Another possibility is that the E-4B escort was playing magic and altering some Lear-Jet to look like a 747, “casting” the squawk code and call-sign onto it...practice.
When Xao was flying home from Alaska, an E-4B made planes appear, hover them in the air, make them reappear and change radar signatures. Four birds in total and only one was Xao.