Does your morning flight mean you must leave the house at the crack of dawn or spend an extra two hours in rush hour traffic? If so, consider staying at a Park and Drive motel the night before your flight.
These packages can be helpful for that early morning departure or late night arrival flight. Most require you to pay for one night's lodging (either coming or going) for your car to remain, free of charge, in the motel's guarded parking lot for one to two weeks.
David and I used a Park and Fly motel this winter and paid only a little more than we would have paid for an airport parking garage and less than we would have spent on taxi fares.