mmm .... if we take the internal fuel as around 370 gallons (I think?), 9 x 45 gives another 400 gallons in drums ... so if we really want to do ferry flights, even if there isn't a mod, we could run the tanks more or less dry then slide them back up to 100% from the weight and balance menu and call it fuel being pumped in from the drums ... we could even get flash with the payload to reflect the TOW of 400 gallons of fuel, and remove that when we refill ... well it sounds like it would work
Check the FAQ. Number 12 fixed this for me:
12. Why are AI aircraft buzzing the airport and never landing?
While not caused or even related to Simple Traffic, this is annoying. There is however something you could try. Try setting the AI mode to 'Off' then back to 'AI Offline' mode, after starting a flight. The AI planes will then be a bit better behaved. The same thing can be achieved by changing the time, or the weather, as this causes the offline AI to reload