Thank your for your great website and coverage.
Just let me add some observations about Lufthansa trying to establish a long-haul operations from Berlin. Back in the 1990s (long before rigorous regulations about travel to the US) Lufthansa tried to establish a route from Berlin to New York with one stop at Hamburg.
Experiencing the long-haul wide-body aircraft on the short intra-German hub was really great. They even allowed "local passengers" to book (and naturally pay) for one of the 2-2-2 First Class seats.
The transatlantic route lasted exactly one traffic season and then the passengers had to travel through Frankfurt, Dusseldorf or Munich again. If I remember correctly the stated reason was that Economy sales was fine there was a lack of Business and First Class pax.
The lesson learnt was that even a combined route with two origin airports of Berlin and Hamburg was notg enough to feed a comparatively small Airbus A 310 Extended range. Since then large parts of the government have relocated to Berlin but the problem remains: To less of value-traffic.
That said I am not optimistic about long-haul from Berlin. Eurowings may fill the Economy Class with saver fares. It will be difficult to fill the "BEST" seats in front (should be 21 seats in 2-3-2 instead of 2-4-2) .
If you would like to feed passengers from the other hubs:
And the flights BerlinMunich and BerlinDüsseldorf, BerlinFrankfurt are Lufthansa mainline and not Eurowings no-frills services. So why should passengers shuttle to Berlin and then change to Eurowings?
That sub-fleet doesn't make any sense. Except it's a kind of flagship operation showing the new brand at Berlin.
Additionally this small sub-fleet is not very robust regarding delays of all kind. So the Berlin station will be "capital of the EU 261 compensation" for the Lufthansa group.
I am convinced that Lufthansa will regret this move.
Better way would be to introduce some kind of "international" flight from Berlin-Tegel (non-Schengen) to Frankfurt (non-Schengen) and clear immigration and customs at Berlin. This would be an advantage over the other airlines which shuttle their guests with short-haul operations (Schengen to Schengen) and then clear immigrations/customs at a central hub.
A sub-fleet of A 321 would do it and could transfer passengers to Frankfurt where a vast choice of intercontinental connections of the LH core brand is available.