14 CFR Part 121 (04):

http://www.access.gpo.gov/nara/cfr/waisidx_04/14cfr121_04.html

14 CFR Part 135 (04):

http://www.access.gpo.gov/nara/cfr/waisidx_04/14cfr135_04.html

14 CFR Part 129 (04):

http://www.access.gpo.gov/nara/cfr/waisidx_04/14cfr129_04.html

14 CFR Part 125 (04):

http://www.access.gpo.gov/nara/cfr/waisidx_04/14cfr125_04.html