In response , WestAir formed an eastern division to serve Dulles .
In 1988 , Presidential Airways became a United Express carrier for United 's new hub at Washington Dulles International Airport , but soon floundered .
In response , WestAir formed an eastern division to serve Washington Dulles International Airport .
In 1988 , Presidential Airways became a United Express carrier for United 's new hub at Washington Dulles International Airport , but soon floundered .