Airbus A321 is actually a capable plane as A320 does on short runways. The standard runways in the PH is 2km. ZAM has usable runway of 1.5K right now and CEB is bringing the A21N. You don't need a longer runway if flying is over an hour. Weight is not an issue here. Load factor is. If your passenger is only a hundred why do you choose to fly a 199 seater plane when you can use 150 seater instead? Similarly, if you have 80 passengers with all light baggage why do you bring the A320 when a Q400 will do? PAG and BXU has been served by Q4s from MNL when it is a jet service airport.
Making Sense