(FORTUNE Magazine) – A giant step for Men's Lib: At Chicago's O'Hare and Los Angeles's airports, United Air Lines has installed changing tables in the men's rooms for fathers traveling with babies. ''It's very convenient,'' says high school teacher Mark Anderson, who recently put the Chicago facility to the test with the help of his son, Spencer, five months. ''About the only alternative would be to put him on the floor.'' The diaper drive got off the ground in 1985, when the Fathers Rights Association of New York State sued the city of Syracuse for denying men such facilities at the airport. ''We caught the city with its diapers down,'' says John Rossler, former president of the National Congress for Men. In 1986, Syracuse set up changing facilities that are open to both fathers and mothers. Airports across the country, including Boston's Logan and San Francisco International, now provide similar facilities. Traveling with a baby should be made even less arduous if Poiema Enterprises | of Yonkers, New York, is able to market its Sitter. This product can be attached to the wall and opened to make a changing table, or a seat complete with harness. F.H.K.