For a more efficient view whilst bombing ground targets or intercepting another plane, you can take advantage of certain in-game camera modes — strafing or sniper view. Strafing view is more convenient when you want to release bombs and the Sniper mode is best used for machine gun and canon fire.
Strafing mode can be activated by pressing the left Shift key on the keyboard. By default, the sniper mode is activated by pressing the F key on your keyboard.
You can change the keys by going to «Controls» in the game settings menu. You can find more information regarding key settings in this article