Chain-Type Quantity Index for Real GDP: Air Transportation (NAICS 481) in Illinois was 127.62100 Index 2009=100 in January of 2019, according to the United States Federal Reserve. Historically, Chain-Type Quantity Index for Real GDP: Air Transportation (NAICS 481) in Illinois reached a record high of 130.19800 in January of 2018 and a record low of 65.53200 in January of 2003. Trading Economics provides the current actual value, an historical data chart and related indicators for Chain-Type Quantity Index for Real GDP: Air Transportation (NAICS 481) in Illinois - last updated from the United States Federal Reserve on April of 2024.