Yesterday, I flew from TXL and was quite surprised to see this during taxi:
It very much looks like people boarding an Air Berlin flight, an airline that supposedly does not exist any more. Local time was 12:20pm. What happened here? Did some subsidiary survive the bankruptcy? Did someone buy the brand rights? Did they just not find the time to rebrand all the sold planes (in almost a year)?
Since requested in comments: I do have another shot further to the right. Zooming in seems to reveal that the registration number is D-ABKM (or D-ABKW?)