You can book a cab via following methods:
Online: http://www.bwicarservice.com/index.php
Telephone: +12022622465
Email: info@bwicarservice.com
Yes, it's possible to pre-book a cab with Bwi Car Service Inc, please contact the company.
Bwi Car Service Inc has both regular and air-conditioned cabs, please mention your preference at the time of booking.
Please contact the company on their helpline number to make any changes.
Generally drivers will meet the passengers at the arrivals on airport pick ups but do check with the company.