Well your dear friend Al Capone used to be an aviation logistics manager.... though it wasn’t called that in my day.
if they are saying they don’t have a plane available then I believe them: why wouldn’t they want to earn? The challenge is it’s the height of the holiday season and across Europe most charter planes are booked 100% so very difficult to get a plane...whilst many teams in the Europa League qualifiers are trying to get one meaning anything feee will be at a premium. if you can source one it’s likely to be free in say Brussels as an example. It then has to fly from Brussels to Glasgow empty, fly to Macedonia, fly back to Brussels empty, fly to Macedonia empty , fly fans home to Glasgow, fly to Brussels empty. So 6 flights and 4 of them empty making it a very costly excercise. They would have been able to get a plane but more than likely the cost involved would have made it prohibitive to earning a profit and one that people would buy.
once you hit late October charter planes are parked at airport doing nothing so they are desperate to hire them out, lower prices. Glasgow will typically have 2-3 planes parked so no dead flying to get to Glasgow as the planes here, it’s also not needed for other flights so can sit unused at the destination for a couple of dates. No dead legs wth empty planes reduces the prices.
The dates TNT fans were looking at must have been lucky enough to have an aircraft free in the area.