I don't know much about PIT (other than the Ikea near the airport ) but they clearly are making tons of schedule changes.

All the CO flights I have in the next 8 months have had multiple changes. I keep "losing" legs and have to call (DH is Plat+, making it a quick call) to get the flights reinstated. I "love" calling CO frequently to tell them to put me back on my flight to wherever, and no, I don't want to fly thru ORD in December right before Christmas, thank you.

JetBlue may be in your future.