There isn't an aiport code XAo - it is a fictitious code reserved for credit card billing by IATA
Airport code XAO and XAA are dummy codes used by airlines to bill for specialized services. Example. Spirit Airlines uses them to bill for some of their fare club's annual membership costs. a $59.95 charge billed from XAA to VAO is the member dues for their $9 fare club. See their website for additional details. If you see such a charge on your account contact the customer service department of the billing ariline for the specifics about your charge.
According to VDict.com, it is "he said xao", or possibly, "you follows xao".
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Angles are represented by capital letters. Small letters refer to sides.
Variables are represented as letters so they don't get confused with numbers.
There is no airport with the IATA code XAF.
It is DCA
Most are represented by two letters. It would be impossible for most to be represented by one letter as there are more than twice as many elements as there are letters.
745
Anything you like as long as you specify what is being represented.
'xao wapa' (a Chinese name?) luego hablamos esta noche = then we'll speak tonight
Find out how are keyboard letters represented as binary data.