In my case it's funny because ingame stats doesn't reflect the reality, only the real time AF has been open and active while flying them. Not the total times you used a plane.
In my case it use to be some of these depending on what I want to do. I'd also would represent a logical path or series of normal flights:
LEARJET: All that comes to mind, plus trying to fly from and to areas normally suiited for smaller airplanes.
CONCORDE: Pretty much anything that comes to mind, challenges I set myself, and also emulating "real" routes.
737 NG: Comercial flights and specially when coming or leaving Canary Islands or europe comercial airports.
KING AIR: "Bush" landing and smaller routes from difficult areas to some bigger airports.
F15: Looking for new areas and try to do some difficult things like flying slow with high angle of attack, reaching max altitudes, landing or taking off on smallest air strips etc.
Helicopter EC135: Helipads, etc. Specially on montainous areas such as Lukla to Everest basecamp, also cities, and trying to land on top of the most ridiculous things. Also some difficult piloting through narrow passages through mountains come to mind.
Some tlme ago, and still sometimes I also fly 747,777 300-ER, A320, 787, F18, CESSNA.
"Logical" flight routes I sometimes do.
I could for example represent as close as reality how a flight from some big airport into the Everest would look like starting with either a private jet to a big airport in India or a commercial flight. Then a turboprop such as the BARON or the King Air to Lukla since we don't have the planes that actually flight groups there. In some ocassions I use CESSNA to make it slower or Learjet if I fancy a challenge. From there I take a helicopter to basecamp up the hill.. And then reverse the route all the way to point of origin.
The screenshot is from the 2nd helipad (not the closest I was referring to) where I stopped on my way down to "pick up" some passengers before returning to LUKLA. You can tell how deeply detailing the scenarios IPACS has been. What an amazing job guys.