I will be connecting in FRA in two weeks from IAD-FRA-DUS. My layover is only 90 min. Where is the best place to clear domestic customs to get to the domestic gates?
Also on the Return I am flight DUS-FRA-IAD and have 3.5 hours. Where is the best place to clear the "extra" security for the USA bound flights and is 3.5 hours enough time?
Thanks
Ben