but it is much more cheaper operating one big plane than two little planes. Which is better, flying two small planes or one big plane. I think one big because adding up the landing, fee maintenance etc for two small planes would be a bit higher. Just what I think if Im wrong then thats ok
Yes and no... Cheaper, yes, but more profitable? Frequency of operation is also important. As a simple example, you might have 1000 pax/day on a certain route, but that doesn't mean you can fill a big airplane with 500 pax twice a day. Customers like to fly when it fits into their schedule. So if a competitor is running a smaller regional jet 10x a day to a destination, he'll end up eating the big jets customer base and the bigger jet will go (half) empty.