I have this posted on another thread as well:
Guess I have nothing to lose. I'm staying at the Riverfront and arriving on Monday at 11:00 a.m. I'll be departing for the airport on Sunday, anywhere around 11:00 a.m. - 12:00 p.m. will work. From another thread, Metro Cab looks good (although I'm open to other suggestions). Message me if you're interested in sharing a cab ride.