Following is a small time table from my travel.
Alarm went off, time to wake up. I slept way better than expected.
Started to the airport
Arrived at the airport
Went through security check
The boarding to Düsseldorf starts on time, I was called to the counter before that, because I must have mistyped something at the airberlin online check-in for my visa information, which was instantly corrected.
Landed in Düsseldorf and had a little breakfast
Boarding in Düsseldorf
Landed a bit early at Miami International. All is good.