What is the fine-grained topic of the following text: In a statement released earlier this month, the national carrier announced that it will increase its frequency on non-stop flights between the Ghanaian capital Accra’s Kotoka International Airport and Washington DC’s Dulles International Airport to five days a week. Only return the topic.
Increase in non-stop flights frequency between Accra's Kotoka International Airport and Washington DC's Dulles International Airport by a national carrier.