Frontier Airlines

Frontier Airlines is a US ultra-low-cost carrier (ULCC) headquartered in Denver, Colorado, operating scheduled domestic and limited international routes under a heavily unbundled, à-la-carte fare model. The airline is best known for its animal-themed tail livery and its GoWild Pass, a subscription-based all-you-can-fly product that grants holders access to standby-style seat inventory via the company's mobile API backend (mtier.flyfrontier.com). Frontier went public on the Nasdaq in April 2021 under the ticker ULCC.