That's a KC-10. They perform aerial refueling. Looks like a standard refueling track (long oval pattern). Altitude fits as well as most traffic would be either above or below them in that busy airspace. The interesting bit is where they're orbiting. Team55 indeed.
She's the Ross Perot of the D-party. In fact, I'd say she's almost a perfect mirror of Perot…..in EVERY way.