Not fair to an FO that's upgrading to CA?? When I flew with a regional 10 years ago, my sim partner was upgrading to Captain. He had 7 years on the airplane as an FO, so it was a huge benefit to me and he said he learned from me as well. Matter of fact we are still great friends to this day.
It is defintely more to save money and also there are so many FOs being hired, it would be difficult to pair everyone up with an upgrading FO.
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