'EPWA' is the ICAO code (International Civil Aviation Organisation) for Warsaw Chopin Airport. The ICAO code is a 4-digit code given to each airport. Anything starting with an 'E' is an airport in northern Europe, with 'EG' being any UK airport, and 'EP' given to any airport in Poland. I thought I'd add the codes whenever I spot around an airport, for any aviation geeks/enthusiasts who may be using the website.