With the 737, even though they've upgraded the length, the avionics, and the wings, the cross-section of the plane remains the same as it was 40 years ago.
That's where all the growth has been. Now there's an acceptance of the A320 as a low-cost workhorse, whereas prior to that the 737 was the plane of choice.
That's where all the growth has been. Now there's an acceptance of the A 320 as a low-cost workhorse, whereas prior to that the 737 was the plane of choice.