for travelling customers, security and environmental impacts. Standards Technical standards for safety and operating procedures at international airports are set by international agreements. The International Air Transport Association (IATA), formed in 1945, is the association of the airline companies. The International Civil Aviation Organization (ICAO) is a body of the United Nations succeeding earlier international committees going back to 1903. These two organizations served to create regulations over airports which the airports themselves had no authority to debate. This eventually sparked an entire subject of air travel politics. In January 1948, 19 representatives from various US commercial airports met for the first time in New York City to seek resolution to common problems they each faced, which initiated the formation of the Airport Operators Council, which later became Airports Council International – North America (ACI-NA). This group included representatives from Baltimore, Boston, Chicago, Cleveland, Dallas, Denver, Detroit, Jacksonville, Kansas City, Los Angeles, Memphis, Miami, Minneapolis-St. Paul, New York-Newark, Philadelphia, Pittsburgh, St. Louis, San Francisco and Washington. Flight logistics International airports have extensive operations in managing flight logistics, such as air traffic control. The latter service is provided by ground-based controllers who coordinate and direct aircraft on the ground and through controlled airspace. Air traffic control also provides advisory services to aircraft in non-controlled airspace. Customs and immigration Airports with international flights have customs and immigration facilities, which allow right of entry. These change over time but are generally designated by law. However, as some countries have agreements that allow connecting flights without customs and immigrations, such facilities do not define an international airport. Security and safety The current trend of enhancing security at the cost of passenger and baggage handling efficiency at international airports is expected to continue in the future. This places financial burden on airports, risks the flow of servicing processes, and has implications for the privacy of passengers. International flights often require a higher level of physical security than do domestic airports, although in recent years, many countries have adopted the same level of security for both. Most international airports feature a "sterile lounge", an area after security checkpoints within which passengers are free to move without further security checks. This area can have services such as duty-free shops that sell goods that have been selected and screened with safety in mind, so that purchasing and bringing them on board flights poses no security risks. In addition