Original sentence: A total of 232 DC-9 aircraft (all variants) were in service as of April 2009, including commercial operators Northwest Airlines (63), ABX Air (35), Aserca Airlines (18), USA Jet Airlines (8), 1Time (4), Laser YV (4), Aeropostal-LAV (4), and other operators with fewer aircraft
Edited sentence: A total of 232 DC-9 aircraft (all variants) were in service as of April 2009, including commercial operators Northwest Airlines (63), ABX Air (35), Aserca Airlines (17), USA Jet Airlines (7), 1Time (1), Laser YV (4), Aeropostal-LAV (4), and other operators with fewer aircraft