This excise started when the government decided that the "airplane ticket tax" was to also apply to award tickets. So some phone companies and others giving out miles charged the mile recipients in proportion to the miles given out.
If the phone company does not itemize it on your bill, it ends up in their total cost of doing business and spread out to all their customers.
Travel tips:
http://members.aol.com/ajaynejr/travel.htm
[This message has been edited by AllanJ (edited Mar 02, 2004).]