Checkthrust,
The "banks" themselves don't own part of Qantas - rather they form individuals holdings that are managed by the banks as part of managed funds
(eg. BT - Westpac, Count - Commonwealth, MLC - NAB)
or as part of Nominee acconts controlling super funds.
See the NAB substantial shareholder announcement on 27/9/13 (search ASX) and you will see most of the shares are for MLC and Antares Capital.
In almost any major Australian company you will see the banks and a few other Nominee companies in the Top 20