Cleveland, the first city in the country to have a municipal airport in 1925, and later led the way in building the first downtown airport, Burke Lakefront, along the Lake Erie shore. The city's proximity to half of the U.S. and Canada and its proximity to other major corporations led to its prominence as a key industry. The I-X Center in Cleveland, now known as a convention hall next to Hopkins International Airport, was originally built to manufacture bombers during World War II and later hosted a facility for the National Advisory Committee on Aeronautics (NACA), which later became the National Aeroautics and Space Administration (NASA). In 1969, a NASA official in Cleveland announced plans to build a new airport capable of accommodating the largest jets being made and supersonic transports. The airport would be an enormous transportation hub, offering luxurious accommodations and access to all the transportation Cleveland has to offer. However, there were concerns that it wouldn't be enough as larger jet airplanes were replacing propeller planes and more space was needed for larger planes. The main issue with airports was noise, with many wanting to reduce noise complaints near their airports. The proposal for a floating airport was controversial due to its location near Lake Erie was rejected due to the Thames River and Seine River in 1930.