Before September 2001 PPBM was not required for US domestic flights, unless certain conditions were met. The airlines said "too expensive" to do it domestically.

Since September 11th, it is now required for all US domestic flights. If you have PPBM on your tag now it means that it is a throwback to when certain ticketing/itin pattens triggered a PPBM for a domestic flight, or that your bag warrants "extra special" handling (due to one way travel, etc).

See this article from June 2001: http://www.findarticles.com/cf_dls/m.../article.jhtml



[This message has been edited by skofarrell (edited 07-10-2002).]