iamflyer Thanks. I was reading info here (
https://www.germany.info/us-en/covid-19/2321562) and on a few other pages which was more ambiguous and didn't have the additional detail around transit. Thank you for the additional link.
UKtravelbear Thanks. I swear their website said 8am when I looked a few days ago

. But now I also see 5am. Good to know that will be an option.
Cheers