For legacy carriers, replacing aircraft is no longer the automatic answer to the need for upgraded cabin products. New jets are incredibly expensive, delivery timelines are uncertain, and many carriers still need to compete right now on comfort, branding, and premium revenue. That is ultimately why cabin retrofits have become such a central part of overall fleet strategy. A redesigned interior can make a mature aircraft feel commercially relevant again, whether that means slimmer and lighter seats, new in-flight entertainment systems, improved connectivity, upgraded premium cabins, or a complete visual refresh.