There is a municipal bus system that can get you around called Citilink (http://www.fwcitilink.com). The system has limited routes and hours of operation.
All major Rental Car Companies have franchises are at the airport, but don't rent here. The airport branches are much more expensive. Call the Enterprise Car Rental location on the SW or NE side and have them pick you up. They have a weekend rate for $9.95 a day, from Friday morning through Monday morning. Reserve other rates online for the best rates.
If you get into the airport on a late flight, don't assume there will be taxis waiting. Call ahead and arrange one on A-1 taxi at 260-478-9910 or 800-871-0518.
