TAA also carried out a minor upgrade program on it's DC9's in order to compete with the 737-200's at Ansett. Cabin interior was refurbished, including addition of overhead bins in place of the old hat racks, minor avionic upgrades and an engine synch system .... which was a blessing for people sitting down the back!!
The DC9 was a great aircraft at TAA and served them well until the CFM powered 737's came along.