Unfortunately, I have to lock this before CornField does!
The loadfactor script is indeed too elastic. A fix had been attempted with a "City Hub" effect which Air Elbonia added but it turned out to be too effective with the more flights you add, the higher the price you can charge. We found that we could start charging ridiculous levels rather than simply stay a little above the competition thus it was removed.
Let us all hope Air Elbonia comes out with a working fix, and be glad this is only a 5 year round!