9th gen iPads have 3 GB memory, right? That is simply not enough for the largest airports (BKK, IAD, LHR, HKG in the future). I have a phone with 8 GB memory and I still play the largest airports on my notebook using an emulator, because they were lagging when there was a lot of traffic. Have you tried changing graphics settings to fast and turning off the 3D landscapes in the settings? Also, check this article for other possible reasons for crashes:
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