Re Qantas investing in TN, i think you will find that the re alllocation of qantas 767s to domestic use, cost Qantas next to nothing!
I have seen the Qantas Aircraft utilisation schedules at that time, and the 767 utilisation by Qantas had large amounts of down time,
and a tighter utilisation schedule released those 767s, with no reduction in international flying!
Boe787, you're only partially correct in that when internationally configured aircraft had some downtime, they could achieve higher utilisation by doing a couple of domestic sectors before the next international trip. However, the seven B762's were assigned purely domestic duties in the early 1990's and replacement B763's (GE) were purchased to maintain the international services. Additionally, seven B763's (RR) were leased commencing early 2000 for purely domestic operations - this increased the B767 fleet to 36 aircraft which was maintained for a number of years before the B762's were retired.