This definitely matches the description by one of the pilots as "a sphere encasing a cube," but it wouldn't really explain the directional changes or extremely high observed speeds.

The object descended from 28000FT to 50FT at 24000 miles per hour with instant acceleration, no signs of thrust or even wings. According to the reports, for me its whether you believe the reports from those that saw it or not. If you choose to believe them, then it's hard to believe the earth tech to allow this was possible in 2004.

I'd like to discuss this further with you privately if you are so inclined. Email is in my profile. Send me something if you'd like to discuss further. cheers