Thanks, darknight! Your comment about the rufous median coverts (which I can't see in the picture I posted) caused me to reexamine this other picture:
mccownsflyq65cropunsharp.jpg 302.01K
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I think I can safely call that a McCown's, especially considering that it's almost certainly the same bird that's in the air in the first picture I posted. (The two pictures were taken within a minute of each other, probably less.)
My old Sibley seems to have a misleading picture of McCown's in flight with the greater rather than the median coverts rusty.
By the way, I'm leaning toward female Chestnut-collared for the other "blurd" in this picture. And I cropped it out, but the black spot at the lower left of the previous picture looks somewhat like a male Chestnut-collared in this one.
And yes, cestma, it's good to have this longspur spot around! (It's about an hour and a half from my house.) There's something to be said for irrigated farming in the desert. I was very lucky to get a trifecta, though.