Without any power generated from the Generator, a lot of inconveniences would be caused, just that if a cell has no mitochondria, most of its key processes would also be hindered.

Also, an airport only has a few energy generators, if not only one. However, despite the small amount, a large and complicated place like the airport is still able to function to it's utmost ability. Similarly, a cell only has a small number of mitochondria (unless it's a sperm cell), but they are still sufficient for the cell to function normally.


One difference is that only eukaryotes contain mitochondria, but almost everything in the airport requires energy generators.

Another is that while mitochondria produce energy in the form of ATP (adenosine tri-phosphate), while energy generators produce energy in the form of electrical energy.