United Airlines has begun daily service between Dulles International Airport and Doha, Qatar, via Dubai. This is the first of three new, previously announced United services from Washington Dulles. The airline will introduce nonstop service between Dulles and Manchester, U.K. today, and between Dulles and Dublin, Ireland, on June 7. Doha is the fourth Gulf city that United serves. It also flies to Dubai, Kuwait City and Bahrain from Washington/Dulles.