APC has them listed, but I'm sure they are all out of date. If anyone has access to a current seniority list what is the total count at your airline (and date the list was published)

APC numbers:

Envoy - 2650
Republic - 3000
XJT - 4633
SKW - 3375
Compass - 439
Endeavor - 1722
Gojet - 510
Horizon - 585
Mesa - 855
Piedmont - 392
TSA - 370
Air Wisconsin - 860
Commutair - 224
PSA - 860