The Terran Republic has the Mosquito
The New Conglomerate has the Reaver
The Vanu Sovereignty has the Scythe

These are hybrid aircraft, serving as fighters in forward flight mode, and as attack helicopters in hover mode. They are glass cannons, relying on their speed and agility to avoid damage, while dealing damage of their own. ESFs reward high skill with high rewards, but the path to get there can be long, since unlike infantry, dying costs a lot of nanites.