I might be off here but I remember hearing something about how much the second JS costs from CAL pilots. I guess not all of their 737s had it, some of the new ones didn't (if I remember right) because CAL balked at $45K/seat to have them installed.

Multiply that over 100 B739s and that's why they're probably not ordered. Demanding that they be installed, if that's even an option, is probably not going to happen.