You are really obtuse or pigheaded. The airport has allready a code, BER, as shown on the IATA website I linked. But also as seen on the airports website itself https://www.berlin-airport.de/de/ges.../ber/index.php . But here is a deal, once it is open for passenger traffic, and it is still BER you owe me a BEER at the BER.

PS: The LAX and ATL metropolitan areas have more than one airport.