Under threat by LCCs in shorter-haul markets, legacy carriers are becoming more dependent on longer-haul international markets. International markets, too, have been opened up by deregulation, though not to the same degree as the US domestic market. The Chicago convention of 1944 established the basic geopolitical guidelines of international air operations, which became known as the air freedom rights. First and second freedom rights are almost automatically exchanged among countries. The US, which emerged from World War with by far the strongest airline industry in the world, had wanted third and fourth freedom rights to be freely exchanged as well. Instead, these and the other rights have been the subject of hundreds of carefully negotiated bilateral air services agreements (ASAs) In an ASA, each side can specify which airlines can serve which cities with what size equipment and at what frequencies. ASAs often include provisions that also regulate fares and the sharing of revenue among the airlines serving a particular international route.