Question regarding a domestic DL delay after EU departure. We flew LHR-ATL this morning on VS (were ticketed via DL though). That flight was not delayed. Our ATL-MEM has been delayed and rebooked and delayed and rebooked again. We were scheduled to arrive at final destination at 6:24. We now will arrive at 9:40, assuming of course that the flight still takes off (we are on a new flight #). Are we eligible for (EC) 261/2004 compensation for 3+ hour delay?

In short: EU-USA flight no delay, USA-USA flight delay of 3+ hours to final destination.