From FlyerGuide Wiki

Gold: For members who fly 25,000 miles or 30 segments on Aero California during a calendar year. Benefits include:

• 25% mileage bonus on Aero California flights.

• 2,500 threshold mileage bonus.

• Priority waitlisting.

• Priority boarding.

• Priority seat selection.

• Accrual mileage summary.

• Special discounts, upgrades and privileges from program partners.

• Personalized credentials and luggage tags.

Platinum: For members who fly 60,000 miles or 70 segments on Aero California during a calendar year. Benefits include the above listed, plus:

• 50% mileage bonus on Aero California flights.

• Complimentary upgrades.

• Extra baggage allowance.

• Priority baggage handling.