I have not noticed them but work keeps me in side most of the time.
In the past when this sort of thing happened it was caused by experimental or secret military aircraft.
But I suppose you can't totally rule out Bigfoot involvement
More likely a grid to calibrate a spy satelite.

Huh.
Living between two major airports this is a common sight. *shrugs*
I bet someone out there went into a tailspin when Art Bell retired!!

m4ever
In Atlanta, we have these special contrails about 10-20 days a month and have had them for about 12-15 years now.