Easy way to reduce your airport parking fees by 50% when leaving town for a few days. We parked our car at Crowne Plaza, alerted the front desk, and then picked up a free ride to National Airport. Smooth sailing all the way. Upon our return, the shuttle bus was filled and could not pick us up. We had to take a $20 cab ride as we did want to wait a half hour for next shuttle. That was the only negative. 15 minutes between pickups, or call for service when needed, would be more desirable than current schedule. Still, we saved quite a bit of money not having to park at airport. Plus, the car was so much easier to find!