Format SCR (Slot Clearance Request/ Response) can be used by right-clicking with the mouse and selecting SHOW SCHEDULE. When a pop-up window appears, you can change the format from 'Plain Text' to SCR.
The message must be in the format as in the screenshot - it cannot be customized.
SCR (type of request)
W17 (indication of season)
21DEC (date of the day)
LTN (Airport at which slots are being requested)
N 124 21DEC21DEC 0000500 011GJ4 1400WAW C (flight details, see explanation below)
N - action code; 123 - flight number; 21DEC21DEC 0000500 - date & day of flight; 011GJ4 - capacity + aircraft type; 1400WAW - origin of flight (IATA) + scheduled timem of arrival; C - type of flight (available types in Leon as below)
SI - free text GI BRGDS - free text
It is possible to change type of the action by selecting an appropriate option from the drop-down box:
Another drop-down box allows to select between airports.