As for system requirements on iOS: They are slightly higher than FS 2021, e.g. especially the memory footprint is higher and the CPU is doing more work. An iPhone SE ( version 1 ) might no longer be a good solution, the current iPhone SE however is just fine. All new and currently available iPhone devices are just fine also, e.g. iPhone 12/13. Also all new and currently available iPad devices are just fine. Expect more performance optimizations once we get more user feedback in certain scenarios.
Some airports are very detailed, for example Frankfurt, so this might be a little too much detail for some devices.
Will 6 GB RAM work fine?