Well I have the same game, although an older version (maybe two years old by now or something like that).
How much do you charge? That seems to make a difference. I find the best system seems to be start low and your planes should be fairly full, then just up it a little each quarter untill the load factors start dropping slightly but are still high.
My current airlines are actually doing quite well with that system.
On one now my load factors are actually pretty good and I'm making a decent profit from my main base of
YVR and focus cities at
YXY,
YZF and
YYC, with my fleet of 5 707s, 24 HS748s and 4 737-100s (with 8 more on order).
My other, with bases at
YZF and YFB isn't doing too badly either with 2 737-200Adv and 5 737-200C, but I still need to get the profits up a litte more for when my leases start running out.
But yeah basically the secret is, in my experience, keep utilization high, prices fairly low, and don't go overkill on frequency.
CanadianNorth