Two CV580's in line astern (ahead?) near Louisville:
(http://www.rbearden.toucansurf.com/FAA%20Convairs.gif)
Rod
Rod
Great catch.
These two FAA Tech Center Research and Development Convairs based in Atlantic city appear to be at the forefront of ADS-B validation testing for ICAO.
One document that mentions their work is here.
http://www.icao.int/anb/panels/acp/wg/c/UAT_SWG/UAT6/UAT-SWG06-WP09%20-%20Validation%20Testing%20Briefing.pdf
Thx for the link, ACW - don't understand much of it, but at least it puts the aircraft in context.
Rod