[Cebu Pacific][1] is a Philippine low-cost airline , which has 6 A330 in its crew. The capacity of each of them is **436** . As far as I know, one of the reasons why airlines introduce First Class cabins is because its impossible for them to fly with a huge number of passengers and their luggage. It makes the plane very heavy and very less fuel efficient. That's why, we don't have any A380 with more than a capacity of 550 , against its maximum of 853. But, how does Cebu Pacific makes profits from operating a 436 seater A330( which commonly has a capacity of 300 people)? 


  [1]: https://en.wikipedia.org/wiki/Cebu_Pacific