Chain-Type Quantity Index for Real GDP: Air Transportation (NAICS 481) in Montana was 24.13300 Index 2009=100 in January of 2020, according to the United States Federal Reserve. Historically, Chain-Type Quantity Index for Real GDP: Air Transportation (NAICS 481) in Montana reached a record high of 161.49300 in January of 2018 and a record low of 24.13300 in January of 2020. 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 Montana - last updated from the United States Federal Reserve on May of 2024.