WILLIAMSPORT, Pa.—Transportation officials say an airport serving north-central Pennsylvania will undergo a $13 million expansion.

Officials say passenger traffic the Williamsport Regional Airport has grown 19 percent over the past two years, due in part to the gas drilling boom.

Airport executive director Tom Hart said in a statement Thursday that plans include a new control tower and new passenger terminal.

Hart says the current terminal was built in 1947. Despite several renovations, he says it's still too small and has multiple infrastructure problems.

Williamsport Municipal Airport Authority Chairman Mark Murawski says officials are working to secure state and federal funding.

He says the terminal is tentatively scheduled to be finished by December 2013.