 Eastern Partner was operated by a Caribbean-based airline, Leeward Islands Air Transport (LIAT), with turboprop service between Eastern's San Juan hub and Antigua, St. Kitts and St. Maarten.Eastern also worked closely with another Caribbean-based airline, Caribair (Puerto Rico).The June 13, 1967 Eastern system timeable lists connecting flights operated by Caribair Convair 640 turboprops with service between Eastern's San Juan hub and St. Croix and St. Thomas.