Help:Start a New Article
Type the name for your new article in the box below and click the Create article button. Rememeber that the format for new articles should be Airport Name (IATA/ICAO) (for example, San Diego International Airport (SAN/KSAN).
For some tips on what to title your new article, see this forum thread.
Don't forget to create redirects for the IATA and ICAO codes, as explained on the main Help page.