# What does 3Q8 mean in the aircraft model Boeing 767-3Q8?

I have aircraft types like Boeing 767-3Q8, Boeing 767-33A, Boeing 767-3P6ER and many others. I know what ER means. But what is coded as 3Q, 33A, 3P6 etc.?

How can I convert it back to more common types like Boeing 767-300? Just replace last two symbols with 00?

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