I think one of the biggest drivers here is the opportunity cost of taking pilots out of flying schedules to provide training on a new platform, and I imagine th

I think one of the biggest drivers here is the opportunity cost of taking pilots out of flying schedules to provide training on a new platform, and I imagine this is exacerbated by the ongoing pilot shortage. Also there are operational efficiencies captured on the maintenance side of things, more streamlined parts inventory management, etc. Then you also have to rework all your routes and contingencies. If you now fly more than one type of plane you have to make sure you always have a pilot available for right type of plain in a specific location if you ever need to restaff a route. That’s all to say that adding a new plane platform to an airline is probably akin to a full replatforming of a production app. Sounds simple but there are tons of nuances with the actual execution.