Towards the oceans. The great plains are in the center of the North American continent and the coastal planes are East, West and South nearer to the oceans and seas.
East
east.
Coriolis effect
Galway is on the west coast and Dublin is on the east coast. So if you are travelling from Galway to Dublin you would travel east.
plains
Because it is exposed to incoming Atlantic storms which travel in an Easterly direction.
New York is on the east coast of the United States. California is on the west coast. Travelling from New York to California you would travel west.
Coastal Plains
I don't really know the air route.But it is rationale to travel west then reach the eastern areas of Russia(eg_Vladivastoc).In fact territorially USA is very close to Russia on western and eastern coast near the pole.
On the coast.
The Plains in Israel are located along the coast it is also a fre coutry
You would need to travel east from Africa to reach Virginia, which is located on the east coast of the United States.