Funny because I saw two of these balloons last week on a flight into BWI and we puzzled over what they were until we queried the Potomac Approach controller. I just wonder - the equipment on those things sounds expensive (is it heavy? - then put it down) - so you’d think they must have some sort of gas venting system that would bring them down relatively intact…
http://6abc.com/news/fighter-jets-tracking-runaway-defense-dept-balloon-over-pa/1055610/
BeachAV8R