There is no 'regular plane' service to Antarctica. Every flight is commissioned, either privately or by a government.
there wouldn't be any tourists in Antarctica
Nothing.
Animals will die
you can reach Antarctica by plan and by ship. In fact ship was used more often in the past but now plane is used aswell from what I know.
we will die in pane
Sea level will rise
It takes 30 hours to get to Australia, and Antarctica is slightly further away, so I would estimate the figure to be around 40 hours.
we would all obviously die
It would generate a global catastrophe.
Antarctica is too cold and dry for agriculture or for growing anything. Within a few hours, the cactus would freeze.
If the plane was in air, it will tip over and most likely crash.
Your answer depends on the size, range and destination of the expedition you want to mount. There is no commercial air traffic to the continent of Antarctica.