Ok, here's more. I'm a wealth of information today (I'm actually just good at copy and paste-ing from airliners.net). 🙂
PIT (230 daily flights, 66 destinations):
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ABE-1x DH8 (Piedmont), 3x SF3 (Colgan)
ALB-3x DH8 (Piedmont), 1x SF3 (Colgan)
AOO-1x BE1 (Colgan)
ART-3x BE1 (Air Midwest)
ATL-1x E70 (Mid-Atlantic), 3x ERJ (Trans-States)
AVP-4x DH8 (Piedmont)
BDL-5x ERJ (Trans-States)
BFD-2x SF3 (Colgan)
BNA-1x E70 (Mid-Atlantic), 2x ERJ (Trans-States)
BOS-1x 320, 1x 734, 2x 319, 1x 733, 1x ERJ (Trans-States)
BUF-1x ERJ (Trans-States), 3x DH8 (Piedmont)
BWI-1x E70 (Mid-Atlantic), 2x ERJ (Chautauqua), 1x CRJ (PSA), 1x ERJ (Trans-States)
CKB-2x BE1 (Air Midwest)
CMH-2x DH8 (Piedmont), 2x SF3 (Colgan)
CRW-3x SF3 (Colgan)
CVG-3x J41 (Trans-States)
DAY-4x CRJ (PSA)
DCA-1x 734, 1x 319, 2x 733, 1x CRJ (PSA), 1x ERJ (Chautauqua)
DEN-1x 321, 1x 320
DFW-3x E70 (Mid-Atlantic)
DTW-3x ERJ (Trans-States), 1x CRJ (PSA)
DUJ-3x BE1 (Air Midwest)
ERI-2x DH8 (Piedmont), 1x J41 (Trans-States)
EWR-1x E70 (Mid-Atlantic), 1x CRJ (PSA), 4x ERJ (Trans-States)
FKL-3x BE1 (Air Midwest)
FLL-3x 319
GSO-4x J41 (Trans-States)
HGR-4x BE1 (Air Midwest)
HPN-2x ERJ (Chautauqua), 1x ERJ (Trans-States)
IAD-4x SF3 (Colgan)
IND-1x CRJ (PSA), 2x ERJ (Trans-States), 1x ERJ (Chautauqua)
JHW-1x SF3 (Colgan), 1x BE1 (Colgan), 1x BE1 (Air Midwest)
JST-1x SF3 (Colgan), 3x BE1 (Colgan)
LAS-1x 320, 1x 319
LAX-2x 319
LGA-2x 320, 1x 734, 2x 733, 2x ERJ (Trans-States)
LNS-3x BE1 (Air Midwest)
LWB-1x BE1 (Air Midwest)
MCO-2x 734, 1x 319, 2x 733
MDT-1x E70 (Mid-Atlantic), 2x DH8 (Piedmont)
MGW-4x BE1 (Air Midwest)
MHT-3x ERJ (Trans-States)
MIA-1x 733
MSY-1x 733
ORD-2x 733, 1x ERJ (Trans-States)
ORF-3x DH8 (Piedmont), 1x J41 (Trans-States)
PBI-1x 733
PHX-2x 319
PKB-5x BE1 (Air Midwest)
PVD-3x ERJ (Trans-States), 1x ERJ (Chautauqua)
RDU-3x DH8 (Piedmont), 1x J41 (Trans-States)
RIC-3x ERJ (Trans-States), 1x J41 (Trans-States)
ROC-1x DH8 (Piedmont), 2x SF3 (Colgan)
RSW-1x 734
SAN-1x 319
SDF-2x ERJ (Trans-States), 1x DH8 (Piedmont)
SEA-1x 319
SFO-2x 320
SHD-4x BE1 (Air Midwest)
STL-3x ERJ (Trans-States)
SYR-4x DH8 (Piedmont)
TPA-1x 320, 2x 319, 1x 733
TYS-3x J41 (Trans-States)
YYZ-1x ERJ (Chautauqua), 3x DH8 (Piedmont)
LGA (203 daily flights, 34 destinations):
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ACK-1x SF3 (Colgan)
ALB-4x SF3 (Colgan)
BOS-16x 319
BTV-7x DH8 (Piedmont)
BUF-1x 733, 7x ERJ (Chautauqua), 2x DH8 (Piedmont)
BWI-7x DH8 (Piedmont)
CHO-4x SF3 (Colgan)
CHS-2x ERJ (Chautauqua)
CMH-6x ERJ (Chautauqua)
DAY-3x CRJ (PSA)
DCA-16x 319
FLL-3x 319, 1x 733
GSO-6x ERJ (Chautauqua)
GSP-3x ERJ (Chautauqua)
HYA-2x SF3 (Colgan)
ILM-3x ERJ (Chautauqua)
IND-7x ERJ (Chautauqua)
ITH-5x SF3 (Colgan)
LEB-4x BE1 (Colgan)
MHT-1x DH8 (Piedmont), 7x SF3 (Colgan)
MSY-2x 733
NAS-1x 319
ORF-2x DH8 (Piedmont), 6x SF3 (Colgan)
PVD-5x SF3 (Colgan)
PWM-5x ERJ (Chautauqua)
RDU-6x ERJ (Chautauqua), 1x CRJ (PSA)
RIC-1x CRJ (PSA), 4x ERJ (Trans-States), 3x ERJ (Chautauqua)
ROA-3x DH8 (Piedmont)
ROC-1x ERJ (Chautauqua), 8x DH8 (Piedmont), 1x SF3 (Colgan)
SDF-3x ERJ (Chautauqua)
SYR-4x ERJ (Chautauqua), 3x DH8 (Piedmont), 2x SF3 (Colgan)
DCA (190 daily flights, 46 destinations):
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ALB-1x 733, 2x E70 (Mid-Atlantic)
ATL-4x E70 (Mid-Atlantic)
BDL-2x 734, 1x 733, 1x E70 (Mid-Atlantic), 1x CRJ (PSA)
BNA-1x E70 (Mid-Atlantic), 2x CRJ (PSA)
BOS-15x 319
BTV-2x CRJ (PSA), 1x ERJ (Chautauqua)
BUF-2x 734, 1x 319
CAE-3x ERJ (Mesa)
CHA-1x CRJ (PSA)
CHS-1x E70 (Mid-Atlantic), 2x CRJ (PSA)
CLE-4x CRJ (PSA)
CMH-1x 733, 3x ERJ (Chautauqua)
CRW-2x SF3 (Colgan)
DAY-3x CRJ (PSA)
DFW-3x E70 (Mid-Atlantic)
DTW-4x E70 (Mid-Atlantic)
FLL-3x 734, 1x 319
GSO-2x ERJ (Chautauqua), 1x CRJ (PSA)
GSP-1x CRJ (PSA)
HPN-3x CRJ (PSA), 1x ERJ (Chautauqua)
HSV-3x CRJ (PSA)
IAH-3x E70 (Mid-Atlantic)
IND-3x 733, 1x ERJ (Chautauqua)
JAX-2x 319, 1x 733
MCI-3x E70 (Mid-Atlantic)
MCO-3x 734, 1x 319, 1x 733, 1x CRJ (PSA)
MHT-1x 733, 1x E70 (Mid-Atlantic), 1x CRJ (PSA)
MSY-1x 319, 2x 733
NAS-1x 733
ORD-4x E70 (Mid-Atlantic)
ORF-1x CRJ (PSA), 2x ERJ (Chautauqua), 1x SF3 (Colgan)
PBI-3x 734
PVD-3x 734, 2x 733
PWM-2x E70 (Mid-Atlantic), 1x CRJ (PSA)
RDU-1x 734, 1x 733, 1x E70 (Mid-Atlantic), 1x CRJ (PSA), 2x ERJ (Chautauqua)
ROC-1x 319, 1x 733, 1x CRJ (PSA)
RSW-2x 320
SDF-1x E70 (Mid-Atlantic), 2x CRJ (PSA)
SYR-2x 733, 1x E70 (Mid-Atlantic)
TPA-1x 734, 2x 319, 1x 733, 1x CRJ (PSA)
TYS-3x CRJ (PSA)
YYZ-2x CRJ (PSA), 1x ERJ (Chautauqua)
BOS (119 daily flights, 22 destinations):
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AUG-2x BE1 (Colgan)
BHB-3x BE1 (Colgan)
BUF-5x ERJ (Chautauqua)
CUN-1x 319
FLL-2x 734, 1x 319
GSO-4x ERJ (Chautauqua)
HPN-1x DH8 (Piedmont), 1x SF3 (Colgan), 1x BE1 (Colgan)
HYA-2x BE1 (Colgan)
IND-4x ERJ (Chautauqua)
ISP-3x BE1 (Colgan)
MDT-3x DH8 (Piedmont)
PQI-2x SF3 (Colgan), 1x BE1 (Colgan)
RIC-4x ERJ (Trans-States)
RKD-4x BE1 (Colgan)
ROC-4x ERJ (Chautauqua)
SJU-1x 319
SYR-1x ERJ (Chautauqua), 2x DH8 (Piedmont), 1x BE1 (Colgan)
FLL (54 daily flights, 22 destinations):
=======================
BDL-1x 319
BWI-1x 319
CUN-1x 733
EWR-1x 319
EYW-4x CRJ (PSA)
GUA-1x 319
KIN-1x 319
MCO-1x CRJ (PSA)
NAS-3x CRJ (PSA)
PLS-1x CRJ (PSA)
PTY-1x 319
SAL-1x 319
SDQ-1x 319
SJO-1x 319
SJU-1x 319, 1x 733
TPA-1x CRJ (PSA)
Can't get any more comprehensive than that!