Don't operate any jets. Use turbo-props instead, or even regular props.
Don't do any flights beyond 2000 NM (if you're using propellers, then this can be extended to around 3500 NM). Returns are minimal compared to costs.
If you're (jet) plane is going to fly, maximize its hours.
If you see any good leasing deals - take them.
Besides, you're lucky they fixed it somewhat yesterday. My maintenance was about to hit 5 billion before they did.
See the maintenance thread in this forum, for more details.