Ideas to improve current system:
Add a per pax per flight cost that is based on the seat type. This should include in-flight meals, lounges etc...
High density versions of each class should have minimal associated costs, but from standard they should rise significantly especially in business/first
New seat types when configuring aircraft
Hi-density as it is now. Should reflect something like Ryanair offers. Minimal costs
Standard short haul. Like current standard, something like major flag carriers offer for short haul Y. Some costs for free in-flight meals etc...
Standard long haul. Should seat almost as many people standard short haul (ie more than current premium) but seats should cost more (IFE etc) and costs per flight should be higher. To get excellent pax comfort less than max number of seats is required
Premium == standard C short haul
Hi-density short haul == Standard Y short haul, ie premium economy, but more costs
Standard Short haul == current standard
Standard Long haul. Seats little less than current standard, but more than current premium. Seats should cost more (IFE etc) and costs per flight should be higher. To get excellent pax comfort less than max number of seats is required
Premium == standard first class
Hi-density == standard short haul C, but more costs
Standard == current standard, high costs per flight
Premium == current premium, high costs per flight
Pax should pay significantly different amounts for different seat/service. Not all pax are wiling to travel at hi-density or premium if there are alternatives. I think that at the moment only hi-density and standard are useful choices, so this should improve it.