Those have been huge, and are a primary driver for new airplane designs. The reason is simple. Back in the 80s, fuel was 40% of the operating cost.
The 757 came about because of new, more efficient engines and a more efficient wing. If my brain hasn't fully rotted away yet, it offered a 35% reduction in fuel costs.
The 737MAX was green-lighted because it offered a 15% improvement in fuel consumption. That's Big Money for the airlines.
Those have been huge, and are a primary driver for new airplane designs. The reason is simple. Back in the 80s, fuel was 40% of the operating cost.
The 757 came about because of new, more efficient engines and a more efficient wing. If my brain hasn't fully rotted away yet, it offered a 35% reduction in fuel costs.
The 737MAX was green-lighted because it offered a 15% improvement in fuel consumption. That's Big Money for the airlines.