According to 9to5Mac, an indie app called Overflight allows users to see which planes are currently flying above them. The app is part of 9to5Mac's weekly Indie App Spotlight series highlighting apps from independent developers.
A flight-tracking utility is a good reminder that a tight single-purpose app can still earn a spotlight, but the data dependency is the real story here: apps like this lean on external ADS-B feeds whose terms and pricing can shift under you. If you're building something similar, worth checking whether the data source allows commercial use and whether you can degrade gracefully when it rate-limits or goes dark.
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HTSApp