sentences:  On 16 January 1955, four P-51s assigned to the 182d were sold to Costa Rica and sent immediately out of country to boost that small country's air arm in fighting a five-day old rebellion.The fighters were dispatched from Kelly AFB in a fully armed state.Fernando Fournier, the undersecretary of foreign affairs for Costa Rica, said it was his understanding that the Mustangs were sold for a dollar apiece.