The first airplane service arrived in 1932, with electrical service on a small scale arriving about the same time. The first suspension bridge over the Cuale went up in 1933. The city's first plumbing system was started in 1939. In 1942, Puerto Vallarta was finally connected by road to Compostela, Nay. Until then the only access to Puerto Vallarta was by sea, air, or by mule trails to the sierra towns. Also in 1942, in the New York-based magazine "Modern Mexico" the first advertisement for a Puerto Vallarta vacation appeared, sponsored by the Air Transport Company of Jalisco. By 1945, the company was landing DC-3s in Puerto Vallarta (carrying 21 passengers).