You could do as jlouis suggested and have each plane or flight manage its own seats/places. The state of different flights or planes isn't necessarily related and can be handled differently, giving you a smaller isolated unit than "everything at once".
This gives place to parallelism as soon as you have more than one plane to contend resources for in your concurrent model, which is most likely the case in the real world.
If you have only one plane, then you likely won't need to scale.
This gives place to parallelism as soon as you have more than one plane to contend resources for in your concurrent model, which is most likely the case in the real world.
If you have only one plane, then you likely won't need to scale.