Airport code Question

I see all airports have a code, and the first letters vary per country, like USA is K, like KLAX and KJFK, And England is EG, like EGLL and EGLC. But what about those airports such as L70 or 38CA in the US or X4IN in England. Why don’t those kind of airports use the “K” or “EG” kind of code?

It may be because they are Echo-Class?

Edit: http://www.boldmethod.com/learn-to-fly/airspace/class-e/
This may be of use

Those are usually highways in that country that might have a strip of airfield for tiny planes.

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in the #tutorials section, @Chris_S did a great thread on ICAO’s explained. My apologies I can’t link it but you’ll find it.

This one?

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As far as i can tell, there’s no direct reason why they have a specific letter per region. Some of them make sense tho (E for England, C for Canada, M for Mexico).

Yes but E is used throughout the United Kingdom and Amsterdam, not just England

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E is also used in Germany

The first letter isn’t for country, because, um, there’s more than 23 countries.

[Yes, I know there are 26 letters in the alphabet. 3 aren’t used for ICAO.]

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