The team fails to sign a five-year lease by Thursday's deadline. Trustees say they will look for new tenants.
The terminal will include passenger waiting space, pilot planning areas and a service facility.
A weak spending report leads some economists to sound a more pessimistic note about economic growth in the current July-September quarter.
When she signed the bill in June, Gov. Maggie Hassan said it provided a more level playing field between national manufacturers and the local dealerships.
The economy grew at a stronger-than-expected rate in the last quarter.