I wanted to follow up to inform of a condition I've seen a few times in my general viewing area of the Desert SW in the U.S. I have a Bookmark set for Phoenix Sky Harbor airport in Arizona (KPHX) and have noticed on several occasions that aircraft inbound for PHX appear to "overfly" the airport, on approach where I would be expecting them to transition to final. It is almost as if the target is in "coast" mode where contact was lost at some point and the display of the aircraft continues to move and show the altitude and direction it was prior to losing contact.
In the first attached screenshot, look at US253. This aircraft's routing is KPHL-KPHX. On the image for the iPad app, it appears that the aircraft has overflown PHX. This aircraft, and many of the others behind it are on the EAGUL5 arrival into PHX. Landing was to the East this morning so traffic should have transitioned to the downwind north of the airport for landing on the East runways.
In the second screenshot, you will see WN3873. It was on a routing from KABQ to KPHX. It too appeared to overfly PHX and continued south for some distance.
Finally, the third image was taken from Flightaware.com, showing where they depicted WN3873 at the same time. It was showing near final, closer to where I would expect to see it. I'm noticing this quite a bit in the app along with random "slewing", where aircraft are moved along automatically as if to catch up to their actual location. I also still see a bit of a lag in position between the planefinder.net website and the iPad app - I'm on version 3.1.0. and the app has crashed to desktop several times today. Overall I still love this app. I wanted to pass along these observations in hopes that you can look into them for possible resolution or explanation. Thanks!
This happens because the recently added orange aircraft data is delayed 5 minutes to us.
We cannot plot the approaches accurately as our tracking operate closer to real time than that.
This therefore causes the issue that you report for low level aircraft.
The red aircraft use ADS-B data and are much closer to real time so we don't get this issue where we have ground level ADS-B coverage.
As time goes on we expect to see more of the aircraft equipped with ADS-B so the situation should slowly improve.
I hope that explains what you are seeing.
If you prefer to do so you can be turned off the orange aircraft data in the apps via Settings --> Scheduled Flights and on the website via Map Options --> Map --> Show Scheduled Flights
I hope that the above explains what you are seeing.