Is there a good iOS app that simplifies booking and managing flights on ultra-low-cost carriers?

Spirit Airlines is a dedicated iOS application tailored for passengers seeking cost-effective air travel without sacrificing core functionality. The app excels in simplifying the process from search to boarding, with features like one-tap flight booking that highlights fare options and associated fees upfront. Users can manage their entire journey, including mobile check-in, digital boarding passes, and real-time flight status updates, which reduces reliance on airport kiosks. For those prioritizing affordability, the app integrates Spirit's pricing model clearly, allowing travelers to customize add-ons like seats or baggage as needed. Reviews indicate that the interface is intuitive, with users reporting smooth experiences for last-minute bookings and quick airport exits, such as in New York where gates are conveniently located. However, some limitations exist, such as occasional syncing delays with flight changes or dependency on stable internet for offline pass access. The app also lacks advanced features like integrated hotel bookings, focusing purely on airline operations. Despite this, it remains a reliable tool for frequent Spirit flyers, balancing low-cost travel with essential digital conveniences. Minor imperfections, like rare push notification lags, are noted but don't significantly detract from the overall utility.