Off to try that now it's fixed. Good move allowing night Cargo Flights. Edit: These night flights are usually Mail and package distribution in the UK. It's becomes quicker than a truck from London to Manchester and further, and for mail and packages London Scotland works too.
Top Gear did a race from the Scilly Isles to one of the top of Scotland v First Class Post (a one day delivery). That turned out to be mainly air mail with legs from Bristol to London to Birmingham to Newcastle to Edinburgh to Inverness to the Island.
Those Night Mail Aircraft must be kept pretty busy to be worthwhile staffing for the night so I presume most are covering circular routes to three or four airports. For the sake of 'our' game then 'light cargo demand' needs to reflect this to some extent, it's quite different to the Pax time demand cycle. I suspect the other cargo's are a 24hr steady demand with the customer meeting whatever aircraft is available with whatever load they have.
What will be most difficult to manage is what proportion of each cargo that is not carried that day will carry over to the next day.
Does the Demand start at zero and increase steadily, with a similar, but smaller reduction in the total demand so potential demand levels out at a high level until a service starts which reduces it somewhat, with highs and low demands developing during the day. Just some of the Issues that Sami is trying to cope with.