I&#x27;ve been thinking recently about crowdsourcing our own dataset of airplane data. When you get on a plane, tap a button that says &#x27;we&#x27;re delayed 5 mins&#x27;. When you land, tap a button that says you&#x27;ve landed.  In fact, you probably don&#x27;t even need users to tap those buttons. The better way would be to use the accelerometer and barometer to automatically detect takeoff and landing.<p>Airplane data sources are ALWAYS wrong in my experience. I have been on a flight that was 2 hours late but all the flight data sources&#x2F;apps would say &#x27;On time&#x27;. Bullshit. And very often there are delays that the flight data does not account for, but are real delays. User&#x27;s phones could provide a much more real-time view on where airplanes <i>actually are</i> than any existing flight data source. I hate sitting on a plane and knowing that I am more up-to-date on how late we are than the official data source is. That&#x27;s super annoying and it seems like there&#x27;s an &#x27;easy&#x27; fix: just build a new kind of crowdsourced, real-time flight data service.