While checking the finances of my different airlines, I was surprised to learn that there's a variable price in the Aircraft family base cost.
For example, in one of my airlines the base cost for the Bombardier Q-Series Turboprop is $932,143, while in the other it's $888,333. Both airlines are in the same world (S1) and both operates Q300 and Q400 aircrafts in almost the same quantity.
Another difference is of airlines in different worlds (S3A and S1) that operates B747s. In one, the base cost is $7,000,000 and the other a hefty $10,000,000.
Is that a bug? If not, then why there are those differences in base cost? Why they can be so discrepant?