The recommended layover time for international flights is generally longer, as you will have to go through customs and immigration before boarding your next flight. In most cases, a 30-minute layover for domestic flights and an hour for international flights is considered a minimum, or short, layover.
Is 35 minutes enough time for a layover in Charlotte?
35 minutes would just barely be enough time to get to your gate IF it arrives in time. Charlotte airport is good size, not massive but each concourse is very long. So it depends on where your gates are in each concourse.