United offers non-stop service to New York (EWR) from Berlin. They recently upgraded from 757-200 to 767-300 (two class version), which has more business seats and twin aisles, making the long flight more comfortable. The new Polaris bedding and food are an improvement. Food quality and selection in economy has gotten better as well. The flight is staffed with Legacy crew now that are NY based, as opposed to the previous crews coming from the CO side.
The flight departs from gates A00 and A01 now, which is on the opposite side of the main building. It's closer to the LH lounge, but further from the rental car facility. Security checks at TXL are extremely slow and the waiting areas are lousy. United starts boarding early, to make the airport situation less miserable.
Update 25 Aug 2019: United now uses refurbished 767-300s with new Polaris seats, which is their latest product. Very nice. read more