The smaller airport called Frankfurt/Hahn (IATA: HHN), mostly used by no-frills airlines such as RyanAir, advertises proximity to Frankfurt. However, Hahn is far away from Frankfurt and it takes about 2 h to drive there from the city centre. For that airport, if you have to use it at all, allow more time in your travel plans and budget. A bus  from Frankfurt/Hahn to Frankfurt Main airport and on to Frankfurt Hauptbahnhof (Frankfurt Central Station) costs about €14 and leaves roughly every hour (much less often on Sundays, . 8:00, 12:00 and so on): tickets are available from the kiosk, outside in front of the main entrance. Often this bus does not have capacity for everyone wishing to take it, resulting in waiting an hour for the next one or very expensive taxi rides.
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Welcome! I am a PhD Student in the Machine Learning Department at the Carnegie Mellon University. Advised by Emma Brunskill , I work on sequential decision making with focus on reinforcement learning. Before joining CMU, I obtained a Master's degree in Computer Science at TU Darmstadt where I had the pleasure to work with Jan Peters and Gerhard Neumann in the Intelligent Autonomous Systems group. Prior to that, I obtained a Bachelor's degree in Computer Science from TU Darmstadt and worked on semantic image segmentation advised by Peter Gehler , Sebastian Nowozin and Stefan Roth .
Altes Hauptgebäude of Technische Universität Darmstadt, 2008