My girlfriend and I were flying JAX-LGA on the 6:10 AM flight on 5/29. We were then planning to take an 11:15 Amtrak train from Penn Station to Albany (we booked this way to avoid the high fares at ALB). Around 6 AM, the gate agent announced there was a mechanical delay. We finally boarded around 8, taxiied out, and a different mech problem popped up. Taxiied back, deboarded, and called DL to rebook (gate agent had said it was time to rebook at that point, given the givens...).
ATL was also backed up that day bc of WX, and several JAX-ATL flights were delayed. The earliest we could get into NYC on another flight would have been 5pm, which would have meant waiting for the 8pm train. I asked about rebooking right into ALB. There was only 1 seat left on the evening connection, so I asked about other airlines. We were booked onto a noon US flight via DCA. Got in to ALB around 4:30, not a bad deal.
Our original flight finally took off at 12:30, got in around 3, which meant we would have made the 5pm train... getting in close to 8. We were also able to get a refund on our train fare. So we definitely came out ahead.
My question is whether I should email DL about any other kind of compensation, and how I should phrase it. Given that we got rebooked right into ALB, and saved on our train fare, I'm definitely happy with the way things worked out, and I don't necessarily feel that we *need* to get anything else. But if they're willing to hand something out, I'll take it

Any advice?