Austrian Airlines independently operates daily Frankfurt (EDDF) - Vienna (LOWW) - Frankfurt (EDDF) and Zurich (LSZH) - Vienna (LOWW) - Zurich (LSZH) with MD-82.
Both flights connecting TWA services from New York JFK at Frankfurt and Zurich.
Austrian Airlines independently operates daily Frankfurt (EDDF) - Vienna (LOWW) - Frankfurt (EDDF) and Zurich (LSZH) - Vienna (LOWW) - Zurich (LSZH) with MD-82.
Both flights connecting TWA services from New York JFK at Frankfurt and Zurich.