Evidently the 737 meets the financial needs of the airlines. Clearly you characterize the 757 as a specialty aircraft (also a 707 child) that lost its luster years ago because the world's aviation network advanced into the remaining third world countries. As an example, in the 80's and 90's the 757 was used in China because outlying airports did not provide refuleing resources. (Round trip on one Tank of fuel). ... I get it, I also have favorite aircraft; It's tough getting old!