Using the 737-8 as an example, many airlines such as TUI, Ryanair, Transavia, SkyUp have started to or have implemented ‘Split Scimitars’ onto their aircraft, decreasing fuel burn.
But then the defualt 737-8 in game has regular winglets, so my idea is to add an almost upgrade system to reduce fuel burn, For example:
Base 738 (No winglets or scimitars) = 96,000₩ (Most fuel burn)
W/Winglets = Base 738 + 20,000₩ (less fuel burn)
W/Scimitars = Base 738 + 40,000₩ (least fuel burn)
This could also be done the same with engine types (thank you @ukplanespotter757 ) especially with the A330 seriers, where a more fuel efficient engine costs more ₩. But lets go one idea at a time for now.
Thank you so much again @ukplanespotter757 for the feedback, what do you guys say?