The Frontier Airlines mobile application serves as the primary digital touchpoint for customers of the ultra-low-cost carrier, providing comprehensive flight booking and travel management capabilities. Positioned as a practical tool for cost-sensitive travelers, the app emphasizes functionality over aesthetic flourishes, aligning with the airline's budget-oriented service model. Core functionality includes flight search and booking with real-time pricing, seat selection across multiple tiers (Standard, Preferred, Premium, and UpFront Plus), and baggage/ancillary service purchases. The route map feature enables destination exploration, while trip management allows modifications to existing reservations. Flight status tracking provides gate information and schedule updates, though some advanced features like real-time aircraft location are absent compared to legacy carrier apps. The interface employs a minimalist design with clear typography and intuitive tab-based navigation. The check-in process follows a linear, step-by-step format that efficiently guides users through identification, seat selection, and add-on purchases. Performance testing reveals quick load times for flight searches and stable performance during booking processes, though some users report occasional lag when loading complex itineraries with multiple segments. User feedback consistently praises the check-in experience, with AAA Traveler (August 24, 2025) noting the 'smooth and easy' system and Markolfa123 (September 2, 2025) describing it as 'super easy and straightforward.' Multiple reviews highlight the straightforward interface design, though the absence of more critical reviews in the provided sample limits comprehensive balanced analysis. The emphasis on practical functionality receives particular appreciation from users seeking no-frills travel management. The application excels at its primary functions of booking and check-in while maintaining the airline's focus on ancillary revenue generation through upsell opportunities. Limitations include less robust rebooking capabilities during disruptions compared to full-service carriers and occasional interface inconsistencies in older iOS versions. The app serves budget travelers effectively but may lack sophistication for users expecting premium travel management features.