United Airlines announced a slew of new destinations and increased frequencies to its route network Monday morning, including some changes at Bush Intercontinental Airport. Starting June 8, United will offer two daily flights from Bush Intercontinental Airport to Springfield-Branson National Airport in Springfield, Mo. It is also increasing the frequency of its flights to Hartsfield-Jackson Atlanta International Airport and Charleston International Airport in South Carolina to eight times a day and three times a day, respectively.