Airport entries should be completed as follows:

• Name - This should be the full name of the airport, such as 'London (Heathrow)' or 'Pisa (San Giusto)'. It must be unique, and at least 5 characters long. If similar names already exist in the database, a warning will appear, with an option to view the similar names. This is to avoid entering a duplicate airport with a subtly different name to the original.
• ICAO Code - Enter the 4-character ICAO airport code. All characters will be converted to upper case automatically so egll is as acceptable as EGLL. If the code is already in use in the database, a warning message will appear.
• IATA Code - Enter the 3-character IATA airport code. All characters will be converted to upper case automatically so lhr is as acceptable as LHR. If the code is already in use in the database, a warning message will appear.
• Latitude and Longitude - enter N/S/E/W in the first box, whole degrees in the second, and minutes in the third. Minutes can be entered with decimal places if desired. This data is vital for day/night and distance calculations.

Clicking on 'Discard Changes' will close the 'Add Airport' window. If you have made any changes, you will be asked to confirm this before your changes are lost.
Clicking on 'Save and Exit' will save the airport to the database, and close the 'Add Airport' window.

If there are any errors in the entries, a warning message will pop up to advise. See data entry for details of acceptable data formats.