Originally Posted by
Check Airman
As far as I know, no US airline allows this. 757/767, yes. Some management, or maintenance pilots, yes. But the average line pilot will only fly one type. The 767-400 is a different category as well.
Likewise for relief pilots. US airlines train you as either CA or FO. You'll be assigned the position on some flights (CA or FO, as appropriate) depending on what your bid preferences are.
I believe UAL pilots include the 767-400 in their 767 category bid?