Corporate Air at AGC as well as Corporate Jets... They are the main operators.
The pay for the two is fair and they do fly often. The hard part is getting on...
There are some operators out of AFJ as well, mostly props though. King Airs and Chieftans as well as an aeromedical outfit.
Zelinople has a 1 or 2 king air operators who do a decent amount of flying.
Prospect at BVI... All I will say here... meet the people, they have a few "oddities" in regards to attire, pay, schedules that may not be for everyone.
PIT area can be challenging to get a job, especially with many "U" people on the street still....
Finally, some corporate (Heinz, Mellon Bank, and so on) but I could not tell you what they would look for and IF they are even looking...