has flown since the last main check (flight hours).

You will have to remember to put your planes through these main checks. This is
done by clicking on the tool icon on the route screens.

If you forget to put a plane through the main checks, the risk of that plane
crashing will increase as time passes. The plane could also be grounded for a
main check by the aviation authorities.

A main check normally takes about one month, but if the plane has been
grounded by the aviation authorities, the main check will take a bit longer.

6.1.5 Charter screen

The icon for the charter screen shows a person with a trunk.

From time to time different charter contracts are offered to the airline
companies. The charter contracts will appear on the charter screen.

If you are interested in flying charter routes, you will have to enter this
screen once in a while to see if there are any contracts available.

If you find an interesting contracts, you will have to give a bid on flying the
charter route. It will be necessary to take a look at the contract information
to avoid giving too low a bid.

At the left of the charter screen you will see the different contracts and when
you click on one of the them, further information on that specific contract will
appear on the sheet of paper at the right side of the screen.

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