Fair on the tight booking for ATL. MSP is pretty straightforward for connections and 2hr is plenty (and next May you shouldn't have to worry about winter weather there). You could potentially do a mix too of MSP on the outbound and something else on the return depending on what connections look like, DL is usually pretty flexible about that (though MSP is also really straightforward for coming back in the country, at least if you have GE -- can't speak to the non-GE experience).