The question is pretty much in the title, I was definitely not expecting to see a Luftwaffe branded plane, so I'm curious to know what I'm looking at! At the time of posting the plane is sitting at Tirana's international airport
The aircraft 15+11 is an Airbus A321LR (the long range variant of the A321neo) operated by the German Air Force (Luftwaffe) as a troop transporter and MedEvac plane:
The Air Force has taken delivery of the second Airbus A321LR from Lufthansa Technik in Hamburg. The aircraft with the tactical identification 15+11 will soon be available to the emergency services for troop transport and parliamentary flight operations - and will be given another task in 2023.
The 15+10 is followed by the 15+11: Germany has two state-of-the-art A321LRs for special Air Force tasks. Starting next year, both aircraft will also be equipped for medical transport and evacuation flights (MedEvac).
(aero.de News, 2022-08-19, in German, translated by Google)
It arrived in Tirana yesterday evening from Frankfurt:
The flight was probably for the German Foreign Minister and her delegation who arrived in Tirana yesterday to discuss the recent tensions between Kosovo and Serbia (thanks to @DeltaLima for the link).