Decent availability in BA First from Germany (and also other European cities) to NYC, US east coast, and for a few hundreds more up to LAS, PHX, DFW... Example below. Mainly Dec-Mar.
Also a smaller TP run possible up to LAS for 2700EUR: should return 780TP and +31k Avios ... play around with it. Fare rules allow for a stopover in LON/MAD/HEL for 150 USD. But didn't manage to route via HEL fx in my few attempts.
Bookable on BA's webpage.