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A medium helicopter charter might be $1200/hour, SF to Tahoe is ~130 nm, so ~1.5 hours each way.

Of that $1200/hr, $150/hr is fuel, $50/hr is engine maintenance, and maybe $100/hr airframe maintenance. These scale linearly with time. For fixed costs, a new helicopter is ~$3 million, so figure $300k per year in depreciation, taxes, insurance, and finance costs. Add another $150k/year for pilot salary and training. If you find lots of customers and keep the helicopter busy, say 1000 hours a year, there's $450 an hour for fixed costs.

The real key to reducing costs is increasing utilization, this keeps the fixed costs reasonable. Batteries and motor will likely improve fuel+engine cost, but also hurt utilization because charging takes more time than refueling. A large network improves utilization. But building a network, with various types of demand (leisure on weekends, business commute during weekdays, cargo during off-peak periods?), is the real challenge.