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Leon can help you to track all aircraft refuelings. In the main section Refueling you can view details of previously inserted data.
To add a new refueling go to Handling > Refueling and click on 'New refueling' icon. This will take you to a new window where a few details need to be filled in.
Refueling screen is divided into 2 sections: Receipt and Invoice.
Next to New refueling option, in Refueling section there is one named Unrefueled legs. Click on it to find out which fuel receipts have not been added yet. Click on to go to the 'Refueling' screen and add missing data. You can always add a new refueling for unrefueled legs by using 'new refueling' option and specifying airport, aircraft, date & quantity of fuel.