Flight path and Trade route

Flight path noun - The path of a rocket or projectile or aircraft through the air.

Trade route and flight path are semantically related In some cases you can replace phrase "Trade route" with "Flight path", this phrases are similar.

Trade route noun - A route followed by traders (usually in caravans).

Flight path and trade route are semantically related in route for traders topic. You can use "Flight path" instead a noun phrase "Trade route".