I get a lot in south eastern Utah. South of Moab there is a "crossroads" for aircraft. I have a shot with an Anasazi ruin with 20 trails across the sky. (Winter afternoons is best)
May I ask what the project entails? book? environment?
I've always been fascinated with contrails/jet trails, but never really spent any time specifically photographing them. As has been said, anywhere between major hubs and below major flight patterns. Here in northern CA, we get the north-south, Seattle/LA route as well as all the east-west routes coming in to SFO, OAK and SJ.
I agree with Mark that atmospheric conditions play a big part in whether or not the trails remain visible, allowing for the winds to create patterns and such. Also, they seem more prevalent around sunset/sunrise. Yosemite has always been a spot where they're noticable, probably more because you notice them and wish they weren't there! I recall a sunrise at Mono Lake where I counted at least 15 individual contrails.
I think the desert SW would be fine. Death Valley may be too far north, but somewhere in the Mojave. Hard to predict though.
Just for fun, here's a contrail I caught in Yosemite years ago. Fascinating how the contrail casts a shadow on the upper atmosphere!
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