For the Apache, using info_node_air will work but will have difficulties finding it's enemy and will wobble weirdly.
For the Osprey, the game/mod will crash because it expects path_corner entities and not info_node_air ones.
To check your info_node_air placement, compile the map and run it. From the console, you can use the impulse 195 command to see a glowing path of node tracks for flying monsters. This will show up any weak points in your placement and areas that may need more nodes.
This entity has a "hint" attribute but it's not used by Half-Life monsters so don't bother setting one. It was supposed to give hints to the bullsquid towards human blood. Same for the houndeye with blinking lights, machinery, alien and human blood.
Likewise, an "activity" attribute exists but it's not used by Half-Life monsters. It was supposed to tell the monster to perform a specific activity when it was ordered to. Don't waste your time setting one.