Do you drive a hybrid car and want to park for free and make money the next time you travel to the airport? The new service FlightCar is popping up at airports across the country. Offer to rent your car, and you'll get to park for free. If your car is rented, you'll get a portion of the rental fee. Your car also gets washed before it's returned to you. Each car is insured for up to $1 million. You can find FlightCar in Boston, San Francisco, Los Angeles, Dallas, Philadelphia, Seattle and many more markets.