What's the easiest/fastest way to get from the airport to the main train station using public transportation (no taxis)? My husband and I will arrive at the airport around 7:30 am on a Sunday and hope to catch a 10:30 am train to Cologne.
There's a airport express bus that goes directly to HBF.
http://www.airport.de/en/bus.html or
http://www.jasper.de/en/range-of-services.html
That Jasper-bus takes 25 minutes.