Why not on planes? because shipping them is easier and more reliable and they almost always end up at the destination on time in intact. And they take up space.
This may or may not be important to you.
If you check them in as luggage (box), then they are not treated as well.
use garden stakes to secure them to the ground. middle and corners. Just punch them through the material, no need for weights. https://www.amazon.com/gp/product/B08GHTVB2D/