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Re:FBI operating fleet of surveillance aircraft flying over ... by jjwiseman on Tuesday June 02, 2015 @08:46PM (#9649958)
Here's a reference to the FBI using "JENNA" from 2011: http://theaviationist.com/2011/05/15/the-white-fest-b757-and...

I found one link that claimed he found an FAA or DOJ publication that had at one time mentioned the JENNA callsign, but was then edited to remove the reference.

Re:FBI operating fleet of surveillance aircraft flying over ... by vonklaus on Tuesday June 02, 2015 @10:27PM (#9650231)
This is similar to the callsigns of the Area 51 planes flying from vegas. JANET was an acronym for Just Another Non-Existent Terminal[0]

Interested to see what JENNA stands for.

[0]http://en.wikipedia.org/wiki/Janet_(airline)