 While the Port @-@ au @-@ Prince airport ramp has spaces for over a dozen <unk> , in the days following the quake it sometimes served nearly 40 at once , creating serious delays . The supply backup at the airport was expected to ease as the apron management improved , and when the perceived need for heavy security diminished . Airport congestion was reduced further on 18 January when the United Nations and US forces formally agreed to <unk> humanitarian flights over security reinforcement . 
