Didn't CP operate the 737 on the YYC-IAH route?
I've flown the CP 737 on 3 routes - YYZ-YOW, YYZ-YUL, and YYZ-MIA. None of the flights had an entertainment system. I'm curious to know exactly how many 737s in CP's fleet contain entertainment systems. The seat maps always showed the video screens.
On a positive note, the Y seats on the CP 737 are quite comfortable compared to 737 seats on other airlines.