It is based on the Airline improvement of reliability from the beginning of the month. If the Airline reliability total score was 15.000 points at the beginning of the month and 20.0000 points at the end its monthly score will be 5.000 points.
For each flight the Airline reliability score is calculated as follows:

1. Flight completed uneventfully: equal to 10% of miles flown x coefficient of that flight.
2. Flight completed with delay: as above, minus an amount of points proportional to the delay length.
3. Flight canceled: deduction of an amount of points equal to one half of nautical miles of that flight.
4. Flight with emergency landing: deduction of an amount of points equal to the nautical miles x coefficient of that flight.*
5. Flight crashed: deduction of an amount of points equal to the nautical miles x coefficient of the aircraft involved.**

* The flight coefficient is equal to 1 for a cat. A flight, 2 for a cat. B..., 9 for a cat. J. Flight category does not coincide with aircraft type, it is not visible but it depends from the amount of payload flown.
** The aircraft coefficient is directly related to type of aircraft involved in the crash. Coefficient is 5 for aircrafts of A type, 6 for B type..., 13 for J type, that obviously means that bigger is the aircraft involved in a crash, lower the customer perception of reliability will be.
Transfer ferry flights are not accruing any point whereas they will cause a deduction of points in case of flight cancellation, emergency landing and crash.

Examples:

1. Flight of 100 nm, Cat. B completed uneventfully, +20 points
2. Flight of 100 nm, Cat. B, completed with some delay, +19 points
3. Flight of 100 nm, Cat. C, canceled, - 150 points
4. Flight of 100 nm, Cat. C, canceled by the user, - 50 points
5. Flight of 100 nm, Cat. C, emergency landing, - 300 points
6. Flight of 100 nm, Cat. F, crashed, - 1000 points.