Just for fun, here's pilots by base over the last two years. Since SDF is basically DFW flying, they're combined for more accurate comparison.

DFW/SDF

April 2018 - 133 CA, 119 FO
April 2017 - 177 CA, 124 FO
May 2016 - 187 CA, 150 FO

IAD

April 2018 - 67 CA, 42 FO
April 2017 - 84 CA, 61 FO
May 2016 - 89 CA, 72 FO

IAH

April 2018 - 208 CA, 179 FO
April 2017 - 198 CA, 165 FO
May 2016 - 173 CA, 134 FO

PHX

April 2018 - 85 CA, 85 FO
April 2017 - 89 CA, 74 FO
May 2016 - 100 CA, 83 FO


Total active pilots by each snapshot...

2018 - 918 (6.33 pilots/aircraft)
2017 - 972
2016 - 988