existing mainline carrier
(12) the term “existing mainline carrier” means a mainline carrier (as defined in this subsection) that on January 1, 2001 , was— (A) certified under part 121; (B) qualified to provide mainline nonpriority bypass mail service; and (C) actually engaged in the carriage, on scheduled service within the State of Alaska, of mainline nonpriority bypass mail tendered to it under its designator code.