text: The world's airlines are distinguished from each other by price, service, type of aircraft, and a number of other criteria?
classes:  No, the tourism industry in Vietnam was officially established when Minister Bao Dai established the National Tourism Department on June 5, 1951.  Besides, the tourism industry in Vietnam was officially established when Minister Bao Dai established the National Tourism Department on June 5, 1951.  Yes, the tourism industry in Vietnam was officially established when Minister Bao Dai established the National Tourism Department on June 5, 1951.  Meanwhile, the tourism industry in Vietnam was officially established when Minister Bao Dai established the National Tourism Department on June 5, 1951.