In fairness, last week I had the same problem with my tablet. Trying to move buildings in layout view was impossible . 7 crashes in an hour! Made mistake of running a 1 hr contract on Sunday and that had same effect. At moment seems to have improved. If it was a problem of tablet, it would have started when 7 was updated not now.
If I don't mistake, your device is too old, have not enough ressources to run the new version of Airport city.
=> Be sure that your settings are on 30 FPS and low resolution graphical (normally, it should be the case since 7.2, as the game should detect a low device)
=> Try to close all other running applications on your phone. Run Airport city alone (this should free some additional memory for the game to run)
=> I don"t know if and when G! will apply new fix regarding ressources, it seems they are still working on it
Can we please, please, PLEASE!!!! Do something about the freeze-ups???
Still this continues which I find mostly when editing, both with and without buildings being visible.
Sheesh what should have taken me 20 minutes at the most; I spent nearly an hour just trying to edit my residential community.
I'm having the same issue, and it is most definitely not down to device age as mine is a 4 month old, new iPad air.
I must have suffered 6/7 crashes last night - really really frustrating.
On another note, that reward looks appealing - Good work.