If I recall the video, the exec said the -900 saves the company 20 million per year, vs the 757 same routes etc.

There are other differences for the passenger. the 57 goes higher sooner, better ride. As I pointed out, the F/C lav is larger, every overhead in F/C will accomodate a rollaboard.

It boards/ unloads faster.

With more modern engines the 57 would be close to the -900 fuel burn.

The reason Boeing pushed the 737 so hard is that is cheaper to build the fuselage with the new bonding method. If the line were not shut down, the 57 could be built the same way.
The BIG difference is the cost of acquisition due to lower interest rates when the -900 was rolled out.

As I pointed out, Delta bought 13 of them on the secondary market.

Ironically, the exec in the video said something about " if we are going to compete with Delta"..... blah blah blah

Remember, that 757 put us in a very competitive position over the Atlantic. The -900 could never do it. So, what will we use when the57 is gone?

Boeing has said they are willing to re-open the 757 line if the customers wanted it.

We should be at the front of the line.