Hi,
I have some upcoming flights on AirBerlin DUS > DME and then on S7 from DME > KBP.

From what I can see, in DME the flights arrive and leave from Terminal A. I am a US citizen with a US passport and am trying to confirm I will be able to transfer through DME without a Visa.

From what I can find, it seems I should be OK as I am only in DME for 3 hours (<24 hours). Any help would be appreciated. Thanks!