u/Born_Seat_8069

Hallo leute! I am flying to Berlin in a few weeks, and taking the train to Quedlinburg from there. Mapping my route on DB navigator, it recommends I buy a Regio120plus ticket. However, I’m not sure how long it will take to get through customs and passport control in the airport, so I dont know exactly when I will be at the train station. Is the Regio120plus ticket flexible between trains? For example if I miss the train I originally intended to take, can I ride the next one on the same route with the ticket? I can’t find a definitive answer online.