Sam's Taxi Service
Mobile (214) 502-1470
Sam Safid offers one of the finest rides in town between Signalogic and DF/W airport or Love Field: a comfortable van, classical music, daily newspapers.
Most important: if there is a traffic jam on I-635 or I-75 (happens often enough), Sam will find the side-freeways and main avenues, and you will still get there on time.
Signalogic employees have known Sam for a long time; if you don't want to deal with DF/W rental car hassle and the "isolated rental car return terminal" at the South entrance to the airport, then you might consider renting your car near Signalogic, and using the Sam-mobile.
Rate is about $45 each way, 30 to 40 min depending on traffic.