Do I have to take the train or can I also go by airplane?

When traveling to our partner universities in Paris, Budapest or Zurich going by train is mandatory – plane tickets will not be reimbursed. When traveling to Pisa, going by train is recommended. To our partner university in Istanbul, Madrid, or Bucharest, students usually go by airplane. In general: The use of an airplane must be justified on an additional sheet of the travel expense settlement, and it is up to the travel expenses department to approve the justification.