Skywest was the largest regional airline in 2009 during an economic downturn that greatly impacted the airline industry. It faced challenges including rising costs, falling profits, and disputes with partners. While Skywest performed most maintenance internally to control costs, expenses increased as it acquired new aircraft and outsourced non-routine maintenance. Its profit margins declined between 2008 and 2009 as operating expenses grew despite higher revenues. The regional airline industry was highly competitive and cyclical, closely tied to the economy.