New flights to Dallas have been good for the Garden City Regional Airport. More than 1,400 passengers used the airport in May, and the number is expected to increase to about 1,500 by the end of June. Airport officials say those numbers are more than 50 percent higher than the average monthly figures from the past two years. Passenger numbers are taking off since April, when the airport changed service to American Eagle flights to Dallas. Previously, the airport had flights to and from Denver offered by Great Lakes Aviation Passenger enplanements averaged 928 per month in 2011, a total of 11,140 passengers during the year.