Here are the bases available to new hires. No seniority system for basing. You just pick out of the list and can change every 15 days.

ABQ
ATL
AUS
BDL
BED
BHM
BIL
BNA
BOI
BOS
BTV
BUF
BWI
CHS
CLE
CLT
CMH
COS
CVG
DAL
DCA
DEN
DFW
DRO
DSM
DTW
ELP
EWR
FAR
FSD
GEG
GRR
GSO
GSP
HOU
HPN
IAD
IAH
ICT
ILM
IND
JAC
JAN
JAX
LAS
LAX
LGA
LIT
MAF
MCI
MCO
MDW
MEM
MFR
MHT
MIA
MKE
MLI
MSP
MSY
OAK
OKC
OMA
ORD
ORF
PBI
PDK
PDX
PHL
PHX
PIT
PNS
PSP
PVD
PWM
RIC
RAP
RDU
RNO
ROC
RSW
SAN
SAT
SAV
SDF
SEA
SFO
SGF
SHV
SJC
SLC
SMF
SNA
STL
SYR
TEB
TLH
TPA
TUL
TUS
TYS
VNY