It’s easier for coordination(don’t have to go search where everyone is in a already high stress environment), makes it easier to assist your buddies(lasing a bomb for your buddy for example), and everyone in a formation is usually going to the same target, at the same time, so any defences will have a harder time targeting an individual plane. Furthermore in the age of dog fighting (ww2 + a few early jets), flying together in a formation meant the wingman could help the lead if he was attacked by an enemy(lead gets chased, wingman chases). The most common of these was the finger four formation. Flying in a 2 ship formation also allows for maneuvers like the thatch weave
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