Not an easy browse, but the Australian Transport Statistics Yearbook 2007 has plenty of stats on emissions of all kinds for those of you sufficiently dedicated to your various causes. You're looking for Chapter 10 / p133 onwards. Put the kettle on first!
Glenn Alderton's Qantas DC-3 picture shows the proverbial more innocent age and is featured purely in the interests of lightening up this post!
Actually the DC-3 is painted in Trans Australian Airlines (TAA) colours (See http://www.pbase.com/stevie_j/image/41145201 for another image of the same aircraft). TAA renamed itself Australian Airlines prior to being bought by Qantas in 1992. Nice image though !