I'm pretty airport savvy as I've flown in/out of many European airport, but not Dusseldorf. My brother & his wife have never been to Europe, and they will be meeting us in Munich. They will be flying from Miami on Airberlin, connecting with Airberlin in Dusseldorf for Munich. Their transfer time is 1 hour 20 minutes. I have a few questions I was hoping someone could help me out:

1. Do international flights arrive Terminal C, and domestic flights out of Terminal B?

2. Do you have to go thru Passport Control when you arrive Dusseldorf, then go back thru Security to catch your connecting flight?

3. Is 1 hour 20 min enough time to do all this and will the luggage make the transfer?

4. What problems might they encounter?

Thanks for your help.