Delta, American, US Airways, JetBlue and Continental have restored their flights to and from eastern US. At least 25 of these had been cancelled on Sunday and Monday due to the major snowstorm affecting the US east coast.
To check flights, see:
Las Americas flight status (Santo Domingo) http://www.aerodom.com/app/do/frontpage.aspx
Punta Cana International flights: http://www.punta-cana-airport.com/index.cfm