set CITIES := PITT  NE SE  BOS EWR BWI ATL MCO ;

set LINKS := (PITT,NE) (PITT,SE)
             (NE,BOS) (NE,EWR) (NE,BWI)
             (SE,EWR) (SE,BWI) (SE,ATL) (SE,MCO);

param supply  default 0 := PITT 450 ;

param demand  default 0 :=
  BOS  90,  EWR 120,  BWI 120,  ATL  70,  MCO  50;

param:      cost  capacity  :=
  PITT NE    2.5    250
  PITT SE    3.5    250

  NE BOS     1.7    100
  NE EWR     0.7    100
  NE BWI     1.3    100

  SE EWR     1.3    100
  SE BWI     0.8    100
  SE ATL     0.2    100
  SE MCO     2.1    100 ;