Why is there an ‘X’ in LAX?

The smart folks at Mental Floss recently told us something we didn’t know about airport codes…

From the @mental_floss Twitter feed:

“When three-letter airport codes became standard, airports that had been using two letters simply added an X — which explains LAX.”

Huh!

And while we’re on the subject of airport codes, how much of an expert are you? Take the Mental Floss Airport Code quiz!