There are three companies that contract out the taxis that operate at Dulles Airport; Regency Cab, Checker Cab, and Dulles Airport Taxi. However, all cabs have the Washington Flyer Taxi insignia, lettering and color scheme. One of these companies would be responsible for licensing you and providing you a vehicle to drive. All three companies are conveniently have an office at Dulles airport. They are all located at the same address: Dulles Taxi Dispatch Facility, 23271 Autopilot Drive, VA 20166.
First step is to go the office (no appointment needed). Bring with you a certified driving record. You will have to pass a face to face interview; questions might involve English communication ability and knowledge of the major road in Northern Virginia. You will have sign some forms that will give the company the power to do a background and drug test. If everything goes well, you will receive a call from them after a few days and they will schedule a time for you to come in and do training. Training involves sitting in the front seat with a current driver and observing and learning as he does his job. You maybe also asked to come on for some additional training to improve your knowledge of Northern Virginia. After your training, the company will give you your license and shortly afterwards, your vehicle.
The vehicle is your to keep for 24 hours a day; you can take it home with you. Rent varies between 450 to 600 depending on the company and the type of car. Addition feels include $150 that goes toward the airport. You also will have to pay a flat fee for every fare you pick up. So expect that you be paying nearly $1000 dollars per week.