We've never flown into CA before or needed to rent a car so I need some advice. Previously we drove from Utah...but too far to do that now. We're flying into Ontario airport. Where/how can I get the best deal for a rental car? We will need it from a Tuesday evening through Sunday morning. Which companies are closest and farthest at the airport? Are any onsite? Have any of you had a bad experience with a particular rental car company that you would recommend avoiding? Thanks!