First-quarter revenues at NetJets and FlightSafety International soared by 12 percent and 14 percent, respectively, according to parent company Berkshire Hathaway. Higher revenues at NetJets reflected increased sales of fractional aircraft and flight services revenues due to increased flight hours, while FlightSafety’s increase was the result of increased simulator training activity. Quarterly revenues at its services businesses, which include NetJets and FSI, increased by $284 million, to $2.4 billion, while profits climbed by $34 million, to $243 million.