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If you say you saw hundreds, then Tree Swallow it is! Eastern Kingbirds definitely are found in groups that large. And, looking closer at the birds in flight in the second photo, they look more like Swallows than Kingbirds anyway.

Oh, and also, welcome to Birdforum! Nice to see a fellow Minnesotan on here :)

I'd still say they were Eastern Kingbirds, even with the absence of the white tipped tail. Several possibilities could lead to the white not being visible (certain lighting, worn plumage, stained feathers) and so if that was the only inconsistency you noticed, I wouldn't rely too heavily on it...