One that is the appropriate size and provides adequate drainage.
If the young plants are pot grown they can be planted at any time ,avoiding frost. If the plants have to be lifted from the ground then only move when dormant.
In a pot.
No the seed should be at the first quarter of the pot.
it holds in water?
Pot
no
House plants need repotting when they need it. This is not as silly as it sounds. if you feed the plant properly it will live happily in the pot it is in but if the roots are showing on the surface of the pot maybe it is time to pot it up one size.
No
It would be best and more accurate for you to contact the airport and ask them.
Any earthworm in a pot will have a deleterious effect on a plant in the pot as the workings disturb the roots.
Chrysanthemums are outdoor plants but sometimes people put them in a decorative pot indoors. They will not last long inside but they can be decorative for a few weeks.
Nerine