As developing countries weigh the consequences of borrowing heavily from China for major infrastructure projects, anti-corruption officials in Nepal have begun an investigation into a flagship airport financed and built by Chinese state-owned companies.

Nepal’s $216 million international airport in Pokhara, the country’s second-biggest city, opened in January. China agreed to provide loans to build the airport more than a decade ago. Nepal tapped China CAMC Engineering, the construction arm of a state-owned conglomerate, Sinomach, as the contractor.

The airport has failed to attract any regular international flights, raising concerns about whether it will generate enough revenue to repay loans to its Chinese lenders. Nepali officials have asked Beijing to change the loans into a grant to ease the financial burden, but China has not agreed to do so.