What's the best iOS app for tracking airport shuttle buses in real-time?

Passio GO is a public transit application focused on providing real-time tracking for buses and shuttles, particularly useful in airport and employee commute scenarios. The app excels in environments like Denver International Airport, where users rely on it to monitor shuttle arrivals and departures. Key features include a live tracker that shows bus locations on a map, interactive route visualizations for easy planning, and direct integration with onboard transit monitors, ensuring data accuracy. In practice, commuters can open the app to see exactly when their shuttle will arrive, transforming uncertain waits into predictable schedules. Reviews indicate high satisfaction, with users praising the reliability and convenience for daily airport trips. However, the app's effectiveness depends on transit providers adopting Passio's system, so coverage may be limited to specific networks or regions. Additionally, a stable internet connection is required for real-time updates, which could be a drawback in areas with poor connectivity. For those frequently using airport shuttles or similar services, Passio GO delivers a streamlined experience that enhances commute efficiency.