Bin dumps.......you have to watch for them and be fast on the trigger with cash to spare. Mine in R1 is ranked number 4, I bought over 100 planes from the used bin on one swoop.
I will lease when I can, but if I see any plane disappear I will pull the trigger and buy what I want asap.
Value early game is pure cash, so you will flux in rank big time, once you start buying planes and terminals, you will stabilize in rank and actually start the climb.
Don't try to flood 1500 seats on a 2500 pax route, take a chunk of 3-400 and be done with it for now. My rough rule is enough daily profit on the route to cover both gate leases within 3 days time on that route. If you take a smaller bite, you will not be so horribly effected when someone slams a couple thousand seats on it, and they will big time.
Watch the last ranks, see who is going belly up soon, slide onto their routes so when they go belly up, you take over the route. I call that the vulture list.