Predator UAV's Testing at BWI

Around dawn it has been reported that Predator UAV's are being tested around BWI airport and maybe over Baltimore City. They are testing them in groups of two's and three's. I think this tactic is new. Testing over a dense urban area and in groups...

I am not a expert on the predator..but what would one gain from flying them in pairs or groups of 3..that seems to me to defeat the purpose..i mean they are meant to be hard to see not stealthy but at least less detdectable..am i wrong??

Boomslang

I saw a report that our planning is to use UAVs in groups of four.