That's a calculation I've done before myself.
However, keep in mind that the numbers on APC may not be up to date.
As far as those shops;
1) Probably correct. If you read up on their pages, seems like their sitting some long reserve. Gearing up for something? Only their mgmt knows.
2,3,4) Also likely correct. And a decent ratio for these times...people moving on fairly quickly...gives their training time to catch up.
5) GoJet pilots tend to fly quite a bit. So, could be.
6) SkyWest actually had their own software made...proprietary...to streamline the schedule / bid algorithm. That, and having bases all over the frigging place! Yeah, those #s could be correct.
7) Don't know enough about CommutAir.
8) Mesa runs their people pretty hard.
9) Think those EXJ numbers are off.