Originally Posted by
wco81
... and I have no idea which terminals I'd be arriving from for the TATL flight and transiting to the Swiss flight.
UA and Swiss both use Terminal 1. As you'll be connecting to a Schengen country you'll need to clear passport control in Paris. Your bags should be checked all the way through as has already been said.
You'll then need to re-clear security, but as security at CDG Terminal 1 is done per wing (ie, right before you arrive at the gate) it's normally quick to get through. There is an LH lounge in the same wing that Swiss departs from - after security.