apart from LTU and Martinair, Air France flies to Brussels and Dusseldorf from Punta Cana and Santo Domingo (via Paris), Iberia from Santo Domingo to Brussels and Dusseldorf (via Madrid), Jetairfly flies from Punta Cana and Puerto Plata to Brussels directly, Condor flies I think from Puerto Plata and Punta Cana to Frankfurt. Plenty of opportunities. All those companies have websites. Only Iberia has an online schedule searching and booking program from the DR to Euroope, but the others fly that direction too.