Sounds like contrails to me.

plain old ordinary contrails

In case you haven't heard Donuel, the U.S.A. is heavily involved in a war over in Iraq ... this war is putting a demand on the needs of the U.S. military in ways of various killing tools, food, medical supplies, beer, clothing and military and non-military personnel in large volumens never seen before in your country ... so, the most effective and quickest way to get these supplies over to Iraq is by jet airplane ... these jets will be flying over Washington and all over the U.S. in vast numbers at very high altitudes. Jet engines of these high flying aircraft emit contrails ... read the blue linky.

sIx