BOZEMAN, MT (February 25, 2019). Ten years ago when BZN was handling approximately 700,000 passengers annually, the Gallatin Airport Authority approved a terminal expansion that was built to accommodate 1.5 million passengers each year. BZN expects to meet the 1.5 million passenger threshold in 2019. In 2018, the Gallatin Airport Authority selected engineering firm Morrison Maierle, Comma-Q Architecture, the national expertise of Reynolds Smith and Hills and general contractor Martel Construction to design the next phase of terminal expansion.