Originally Posted by MSPeconomist

OP has an ovenight connection on the return too and I'm assuming (bad idea) that PLS isn't preclear and will arrive into E or F at ATL.

Yeah, for the outbound a departing DL international passenger can check in at the domestic terminal, but it's more of a problem in the other direction, especially if the checked bags cannot go through TSA airport security as carry on pieces due to size, liquids, or other forbidden items.