Encode / decode city & airport

Encode a city name to its code or decode a code to its full name. Handles both cities and airports.

Command entry

DAC LON

DAC LON
LON C LONDON /GB
A LHR - LONDON HEATHROW /GB
A LGW - LONDON GATWICK /GB
A STN - LONDON STANSTED /GB
A LCY - LONDON CITY /GB