[oldmancoyote (OP)]

I seem to remember a National Geographic video talking about this phenomenon years ago, but I can't remember the type of bird for the life of me.  Help! 

[RD]

Bald Eagle courtship involves elaborate calls and flight displays.
The flight includes swoops, chases, and cartwheels, in which they fly high, lock talons, and free fall

http://en.wikipedia.org/wiki/Bald_Eagle

[AllenG]

Sea eagles also show that behavior.

I don't think it is uncommon among eagles.

[oldmancoyote (OP)]

great.  that's so helpful!  thanks!