[ameribbean expat]

Boeing E6 Mercury.

[Parley Baer]

“Boeing E6 Mercury.”

I bet you are correct. In the link it says it flew off towards Oklahoma. That would probably be Tinker AFB. That also fits for it to be a E6.

[Mat_Helm]

Yep,Boeing E6 Mercury is precisely what that is. Looking Glass and USAF is not going to publicly tell anyone what that flight was. Strategic Recon and Nuclear Response communication.