Random anecdote but it appears that the customer service team which handle EU261 complaints are liars.
Since when is DSA not an operating base?
I flew between AGP and DSA back in June and the aircraft was delayed after allegedly being struck by an airbridge in CDG the day before. They're using this as an excuse not to pay out despite the flight being scheduled over 24 hours after this incident. Frustrating to say the least.
Take it to (what was) small claims court