The Yak is a terrible plane.
It can't turn.
It can't climb.
It is slow.
It falls apart easily.
Its' radiator is extremely vulnerable, particularly to rock-throwing street urchins shouting anti-Communist epithets.
Its guns are bad.
The visibility is terrible.
The camoflage doesn't work.
Everybody attacks a Yak as soon as its icon displays.
Dogs urinate on the undercarriage.
So don't fly it.
Ever.
Or bad things will happen to you.
We mean it.
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Sidenote: The most kills I've gotten in a single flight in a Yak is 5, without rearming.