Dreadful flight last Friday 30th March. Our flight was due to leave Tullarmarine at 3:50pm. We (fortunately) got advice via sms that it had been changed to 5:50pm. Seems most folks who checked in for the 3:50pm flight didn't get that info. Get to the airport to find out that our flight was leaving at 6:05pm. Slight problem with that - there was no plane. Seems out flight had been delayed due to a fire in the Qantas Lounge (on Thursday) that had caused delays on Friday???? Anway we all board eventually then spend 3/4 hr on the plane with no air condititioning. I felt very sorry for the people up the back of the plane. Apparently the heat back there was worse than what we had. One lady even came up to the front of the Plane as her baby had got heat rashes from being up the back. You know it is bad when the Crew is stripping off and complaining about the heat. Back into the Terminal and tempers had frayed. One gentleman let rip and was threatened with being chucked off the flight. We were told freshments would be available in the Terminal. We got a cup of water. Back onto the plane and thank god the air conditioning was working. The plane takes off, FINALLY at 8:15pm. The cabin crew let us know that we are allowed a snack OR drink due to the delays. I am sure that meant a lot to the families with hot, tired, cranky kiddies and those at the back of the plane who got nothing due to the cabin crew fluffing around up the front. Maybe it is time for Alan Joyce to do an "Undercover Boss Australia" and see how things are being run.