How much could Boeing save per year, if they could stop the entire 717 service operations immediately incl. the scraping of all spar parts, simulators etc.?
If all 717 operators would return their planes and switch to 737MAX, they would still earn the service fees for a similar number of airplanes.
Boeing has enough unsellable 737 whitetails on stock. It wouldn't have an cashflow impact, to give them for free to the 717 operators.
Don't know about other operators, but Hawaiian would be difficult to persuade. Basically, they run an island-hopper operation, and BR715 is an enabler of short cycles and quick turn-arounds, as it manages to cool (sufficiently) fast enough, while other modern jet engines apparently don't.
This topic has been debated on a.net till folks were blue in the face. Basically, Hawaiian appears to have no obvious Plan B, as far as direct replacement of 717 is concerned; their only clear path is sourcing other 717's -- preferably with less cycles, and less exposure to salt-water spray. Once 717's are gone, they would have to change their mode of operations, and they would hate that.
One option, debated here, was to have surplus 737's or A320's sitting around, and crews would swap their "hot" plane for a "cold" one between hops. That would be an enormous outlay of capital for low productivity. Another would be to run turboprops, probably in some sort of combi configurations (otherwise, not enough space for surfboards, cargo, etc.) -- that would mean a loss of seat capacity.
Unless nature and volumes of Hawaii interisland operations change dramatically -- 717 is the optimum airplane, and Hawaiian is married to it.
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