All over the board and not anywhere near what a regional is. The most "efficient" (cheap) regionals can go as low sometime 8.5-9 pilots per plane. But the average is as stated, 10-11, or 5-5.5 crews on average.

Mainline/legacy is TOTALLY different. Partly due to better work rules, but more so for the wide body/int'l requirements for augmented creed, etc.

If you were to ask 80kts how many pilots are on say the Airbus at DAL, then the 777 or 744, the ratios are probably not the same.