Huge misconception! For companies like AA and CAL that have very strong scope language the 50 seat market is alive and kicking as they can't really expand into any other types. They can do props, but there's only so much and so many you can get. A prop can't efficiently fly into most markets in Mexico that both XJT and AE fly into. A prop is not really good for the long thin routes CAL uses the the XR's and some of the LR's on. So again, in absence of scope relaxation at either AA or CAL (and don't expect any!), the 50 seater is as good as it gets.