The average age of all the planes is around 14 years, with the oldest being the 722 (approaching 18 years)
18 yrs old is pushing the limits of profitable, for the first few aircraft. Idealy, your first aircraft should be in the 5yr-10 range. I wouldn't recommend 16yr+ for starter aircraft. Nine out of ten times you'll end up keeping and flying those aircraft for 2-3yrs. Thus, forced to pay a very expensive C check every time. Which if not fully prepared, will kill your airline before the 1st year is up.
I am not trying to make light of your aircraft selection. If that is what your forced to fly, then that is the handicap you have. Just know that your airline is less efficient because of what you have. That's not to say it can't be done. However, it does make running an airline much more difficult then it has to be.
By the way my planes have an average utilisation time of 17 hours which is something like 30th in the game (out of 290ish)
That's nice. Utilization time is kinda overrated if you ask me. I can have a 20hr+ utilization time running long and thin A-B-C routes and not make nearly as much as someone with a 12hr utilization w/ an avg of 4 routes. Riger hits some very important points:
Not to overstate the obvious but,
- Proper route selection determines (mostly) how much money you make and,
- Proper Aircraft selection determines how much money it costs to make that money.
Five routes will make more money then 3 routes. Always.
To give you an example: Euro Challenge
Fleet Utilization: 12.7 hrs/ 45th of 83
Fleet Size: 65 / 10th of 83
Sales Revenue, Quarterly: 581 901 097 / 5th of 83
The most profitable airline in Euro Challenge has a Utilization of 12.9hrs.
Route selection is fundamental.