Scramble Spirits is a Vertical Scrolling Shooter released for the arcade by Sega in 1988. It was ported to the Master System the same year, then to other home consoles and computers in 1990.
The player starts out with a propelled plane that can fire air-to-air twin machine guns and air-to-ground rockets. These weapons are used for destroying waves of enemy planes and ground and sea units. The main plane is destroyed by one hit. If a certain enemy is destroyed the player can collect a comrade fighter to fight alongside the main plane. Up to two comrade fighters can be collected. The comrade fighters can be assigned to fight in the air to fire bullets or they can be assigned to fight at low altitude to fire air-to-ground rockets. The comrade fighters can also be launched to do a kamikaze attack explosion against the enemy. After kamikaze attacks, the comrade fighters are retrievable, but they are lost if they are shot or crash into an enemy. In some areas of certain stages, the player will fly at a lower altitude armed with only twin machine guns and shooting down parked planes and turrets and can take a limited amount of damage from multiple shots and crashes. At the end of each stage, the player must destroy a boss vehicle to proceed.
Source: Wikipedia, "Scramble Spirits", available under the CC-BY-SA License.