Thanks a million guys.

In Europe, we are protected by law so that airlines are obliged to "care" for their passengers in case of non-travel due to factors outside the passenger's control - this includes non-travel due to bad weather conditions. "Care" means re-routing or refunding. In the case of re-routing, "care" also means food, lodging, transportation and phone calls, depending on the duration and circumstances of the delay and remedial action.

It's worrying to learn that equivalent protection doesn't exist in the US. Just hope there's no weather-related delay for us and all will be fine!

Btw, what are Delta like? It's our first time flying with them.