How to maintain a flawless record as an airline without being perfect:
1. Sell tickets through Airline A.
2. Wait until plane is boarded and ready for takeoff.
3. Sell entire flight, including plane, to Airline B, also owned by you.
4. Wait for safe landing.
5. Sell entire flight back to Airline A.
If there is a crash at step 4, just skip step 5. Now the only crashes occur on Airline B's watch, and Airline A is, technically, faultless. Granted, Airline A has also never been responsible for a successful flight while it was happening, but as long as you can gloss over that fact, you win.
Mokalus of Borg
PS - And you can always create Airline C to replace Airline B when its reputation falters.
PPS - I wonder whether all this is more effort than simply being a good airline.