DFW International Airport could soon be the largest airline hub in the world. The airport made that announcement on Thursday after American Airlines agreed to invest $4 billion to double the capacity of Terminal F.

The project’s expansion comes after American Airlines and DFW agreed to increase investment in the terminal to $4 billion. American also extended its lease and use agreement with DFW to 2043 as part of the deal. The Fort Worth-based airline will occupy all of Terminal F.

Fort Worth-based American Airlines will invest $4 billion into DFW International Airport’s forthcoming Terminal F to double the size of the project and