Originally Posted by GUWonder

When traveling into the US from airports without CBP -preclearance, at some US airports of entry there are intra-terminal flight transfers where it is possible to get between the international arrival flight and onward flights without necessarily going land-side at the US airport terminals. And MSP is such an airport, for some intra-terminal transfer. But in these cases too, whether going via the transfer/transit security routes or going into the general public area before heading to clear the land-side general passenger security screening checkpoints, a passenger re-screening at the US airport is required.

If the thread-starting member was doing KEF-MSP-___ all on Delta, there is a transit security path available at MSP Terminal 1 right after clearing the baggage thru customs; and this means there is a way to avoid going out land-side (into the general public area) at MSP..